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[Valikdu]

Is it just me?
The worldgen (normal, or custom) crashes all the time when there's any surface megabeasts present. But it never does once they're all dead, and a Golden Age generation can go for hundreds of years without crashing.

[Malarauko]

Those are some truly terrible megabeasts its spawning.

[Tiruin]

Did you do anything to the raws OR change any parameters in the Advanced World Generator? How do you know that the cause is specifically because of surface megabeasts when the World Generator crashes? Checking the Legends of stable worlds?

[Valikdu]

When I gen a world, it crashes during an Age of Myth/Legends/Heroes/[a megabeast]. It never does during a Golden Age or an [entity] Age. If I set titans=0 in advgen it doesn't crash.
What would make a custom megabeast to crash the generator? I have several.

Spoiler: Raws (click to show/hide)

creature_dvoice_megabeast

[OBJECT:CREATURE]

[CREATURE:ZERG_DEFILER]
   [DESCRIPTION:An insectoid monster of the Dark Voice, tasked with spreading corruption and decay.]
   [NAME:zerg defiler:zerg defilers:zerg defiler]
   [CASTE_NAME:zerg defiler:zerg defilers:zerg defiler]
   [CHILD:1][GENERAL_CHILD_NAME:zerg defiler hatchling:zerg defiler hatchlings]
   [CREATURE_TILE:'D'][COLOR:5:0:1]

   [BIOME:ANY_LAND]
   [FREQUENCY:50]
   [UBIQUITOUS]
   [FANCIFUL]
   [SEMIMEGABEAST][DIFFICULTY:7]
      [ATTACK_TRIGGER:60:6000:60000]

   [NATURAL_SKILL:BITE:8]   
   [NATURAL_SKILL:GRASP_STRIKE:4]
   [NATURAL_SKILL:MELEE_COMBAT:4]
   [NATURAL_SKILL:DODGING:4]
   [NATURAL_SKILL:SITUATIONAL_AWARENESS:4]   

   [BUILDINGDESTROYER:2]
   [GRASSTRAMPLE:0]   
   [LIKES_FIGHTING]
   [NO_DIZZINESS]
   [NOPAIN]
   [NOFEAR]
   [NONAUSEA]
   [FIREIMMUNE]
   [PRONE_TO_RAGE:100]
   [PREFSTRING:strength]
   [PREFSTRING:terrifying beauty]
   [BODY:SPIDER:UPPERBODY_PINCERS:TAIL:TAIL_STINGER:2EYES:2LUNGS:HEART:GUTS:ORGANS:BRAIN]      
   
   [BODY_DETAIL_PLAN:ZERG_MATERIALS]
   [BODY_DETAIL_PLAN:ZERG_TISSUES]
   [BODY_DETAIL_PLAN:ZERG_TISSUE_LAYERS:ZERG_CHITIN:FAT:MUSCLE:ZERG_BONE:CARTILAGE]
   
   [SELECT_TISSUE_LAYER:HEART:BY_CATEGORY:HEART]   
      [TL_MAJOR_ARTERIES]   
   [BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
   [BODY_DETAIL_PLAN:HUMANOID_RIBCAGE_POSITIONS]
   [USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
   [TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
   [LIGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
   [HAS_NERVES]
   [USE_MATERIAL_TEMPLATE:ICHOR:ICHOR_TEMPLATE]
   [BLOOD:LOCAL_CREATURE_MAT:ICHOR:LIQUID]
   [CREATURE_CLASS:GENERAL_POISON]
   [GETS_WOUND_INFECTIONS]
   [GETS_INFECTIONS_FROM_ROT]
   [USE_MATERIAL_TEMPLATE:PUS:PUS_TEMPLATE]
   [PUS:LOCAL_CREATURE_MAT:PUS:LIQUID]
   [BODY_SIZE:0:0:500000]
   [BODY_SIZE:1:0:3000000]
   [BODY_SIZE:3:0:8000000]
   [BODY_APPEARANCE_MODIFIER:LENGTH:90:95:98:100:102:105:110]
   [BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
   [BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]

   [USE_MATERIAL_TEMPLATE:POISON:CREATURE_EXTRACT_TEMPLATE]
      [STATE_NAME:ALL_SOLID:frozen zerg plague compound]
      [STATE_ADJ:ALL_SOLID:frozen zerg plague compound]
      [STATE_NAME:LIQUID:zerg plague compound]
      [STATE_ADJ:LIQUID:zerg plague compound]
      [STATE_NAME:GAS:boiling zerg plague compound]
      [STATE_ADJ:GAS:boiling zerg plague compound]
      [PREFIX:NONE]
      [ENTERS_BLOOD]
      [SYNDROME]
         [SYN_NAME:defiler plague]
         [SYN_AFFECTED_CLASS:GENERAL_POISON]
         [SYN_IMMUNE_CREATURE:ZERG_DEFILER:ALL]
         [SYN_INJECTED]
         [SYN_CONTACT]
         [CE_NECROSIS:SEV:30:PROB:50:RESISTABLE:LOCALIZED:VASCULAR_ONLY:START:50:PEAK:200:END:1200]

   [CAN_DO_INTERACTION:MATERIAL_EMISSION]
       [CDI:ADV_NAME:Breath plague]
       [CDI:USAGE_HINT:ATTACK]
       [CDI:BP_REQUIRED:BY_CATEGORY:MOUTH]
       [CDI:MATERIAL:LOCAL_CREATURE_MAT:POISONL:TRAILING_VAPOR_FLOW]
       [CDI:TARGET:C:LINE_OF_SIGHT]
       [CDI:TARGET_RANGE:C:15]
       [CDI:MAX_TARGET_NUMBER:C:1]
       [CDI:WAIT_PERIOD:500]   

   [ATTACK:STING:BODYPART:BY_CATEGORY:STINGER]
      [ATTACK_SKILL:STANCE_STRIKE]
      [ATTACK_VERB:sting:stings]
      [ATTACK_CONTACT_PERC:5]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:MAIN]
      [SPECIALATTACK_INJECT_EXTRACT:LOCAL_CREATURE_MAT:POISON:LIQUID:100:100]
   [ATTACK:PINCER:BODYPART:BY_CATEGORY:PINCER]
      [ATTACK_SKILL:GRASP_STRIKE]
      [ATTACK_VERB:snatch:snatches]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:MAIN]
      [ATTACK_FLAG_CANLATCH]
      [ATTACK_FLAG_WITH]
   
   [DIURNAL]
   [HOMEOTHERM:10067]
   [SWIMS_INNATE][SWIM_SPEED:2500]   

   Rainbow Factory.   
   [REMOVE_MATERIAL:NERVE]
   [USE_MATERIAL_TEMPLATE:NERVE:NERVE_TEMPLATE_ONYX]
   [USE_MATERIAL_TEMPLATE:SPEC_RESIDUE:CREATURE_EXTRACT_TEMPLATE]
      [STATE_NAME_ADJ:ALL_SOLID:frozen twilight residue]
      [STATE_NAME_ADJ:LIQUID:twilight residue]
      [STATE_NAME_ADJ:GAS:boiling twilight residue]
      [STATE_COLOR:ALL:AMBER]
      [DISPLAY_COLOR:6:0:0]
      [PREFIX:NONE]
      [EDIBLE_VERMIN]
      [EDIBLE_COOKED]
      [EDIBLE_RAW]
      [MATERIAL_REACTION_PRODUCT:DRINK_MAT:LOCAL_CREATURE_MAT:SPEC_DRINK]
      [REACTION_CLASS:ONYX_SPECDRINK]
      [MATERIAL_VALUE:5]
   [USE_MATERIAL_TEMPLATE:SPEC_DRINK:CREATURE_ALCOHOL_TEMPLATE]
      [STATE_NAME_ADJ:ALL_SOLID:frozen twilight essence]
      [STATE_NAME_ADJ:LIQUID:twilight essence]
      [STATE_NAME_ADJ:GAS:boiling twilight essence]
      [PREFIX:NONE]
      [MATERIAL_VALUE:10]

   [CASTE:FEMALE]
      [FEMALE]
      [LAYS_EGGS]
         [EGG_MATERIAL:LOCAL_CREATURE_MAT:EGGSHELL:SOLID]
         [EGG_MATERIAL:LOCAL_CREATURE_MAT:EGG_WHITE:LIQUID]
         [EGG_MATERIAL:LOCAL_CREATURE_MAT:EGG_YOLK:LIQUID]
         [EGG_SIZE:4000]
         [CLUTCH_SIZE:2:3]
   [CASTE:MALE]
      [MALE]

   [SELECT_CASTE:ALL]      
      [SELECT_MATERIAL:ALL]
         [MULTIPLY_VALUE:10]

[CREATURE:ZERG_BRUTALISK]
   [DESCRIPTION:An enhanced variation of the Ultralisk, set loose to terrorize the lands.]
   [NAME:zerg brutalisk:zerg brutalisks:zerg brutalisk]
   [CASTE_NAME:zerg brutalisk:zerg brutalisks:zerg brutalisk]
   [CHILD:1][GENERAL_CHILD_NAME:zerg brutalisk hatchling:zerg brutalisk hatchlings]
   [CREATURE_TILE:'B'][COLOR:5:0:1]

   [BIOME:ANY_LAND]
   [FREQUENCY:50]
   [UBIQUITOUS]
   [FANCIFUL]
   [MEGABEAST][DIFFICULTY:15]
      [ATTACK_TRIGGER:80:10000:100000]

   [NATURAL_SKILL:BITE:5]   
   [NATURAL_SKILL:GRASP_STRIKE:5]
   [NATURAL_SKILL:WHIP:5]
   [NATURAL_SKILL:MELEE_COMBAT:4]
   [NATURAL_SKILL:DODGING:3]
   [NATURAL_SKILL:SITUATIONAL_AWARENESS:4]   

   [BUILDINGDESTROYER:2]
   [GRASSTRAMPLE:0]   
   [LIKES_FIGHTING]
   [NO_DIZZINESS]
   [NOPAIN]
   [NOFEAR]
   [NONAUSEA]
   [FIREIMMUNE]
   [PRONE_TO_RAGE:100]
   [PREFSTRING:strength]
   [PREFSTRING:terrifying beauty]
   [BODY:PONY_QUADRUPED_TYRANID_BODY:ULTRALISK_TENTACLES:PONY_TYRANID_FOUR_SCYTHING_CLAWS:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:SKULL:PONY_TYRANID_MOUTH:GENERIC_TEETH_WITH_LARGE_EYE_TEETH:RIBCAGE]      
   
   [BODY_DETAIL_PLAN:ZERG_MATERIALS]
   [BODY_DETAIL_PLAN:ZERG_TISSUES]
   [BODY_DETAIL_PLAN:ZERG_TISSUE_LAYERS:ZERG_CHITIN:FAT:MUSCLE:ZERG_BONE:CARTILAGE]
   
   [SELECT_TISSUE_LAYER:HEART:BY_CATEGORY:HEART]   
      [TL_MAJOR_ARTERIES]   
   [BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
   [BODY_DETAIL_PLAN:HUMANOID_RIBCAGE_POSITIONS]
   [USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
   [TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
   [LIGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
   [HAS_NERVES]
   [USE_MATERIAL_TEMPLATE:ICHOR:ICHOR_TEMPLATE]
   [BLOOD:LOCAL_CREATURE_MAT:ICHOR:LIQUID]
   [CREATURE_CLASS:GENERAL_POISON]
   [GETS_WOUND_INFECTIONS]
   [GETS_INFECTIONS_FROM_ROT]
   [USE_MATERIAL_TEMPLATE:PUS:PUS_TEMPLATE]
   [PUS:LOCAL_CREATURE_MAT:PUS:LIQUID]
   [BODY_SIZE:0:0:500000]
   [BODY_SIZE:1:0:4000000]
   [BODY_SIZE:3:0:20000000]
   [BODY_APPEARANCE_MODIFIER:LENGTH:90:95:98:100:102:105:110]
   [BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
   [BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]   

   [ATTACK:SLASH:BODYPART:BY_CATEGORY:CLAW]
      [ATTACK_SKILL:GRASP_STRIKE]
      [ATTACK_VERB:slash:slashes]
      [ATTACK_CONTACT_PERC:35]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:MAIN]      
      [ATTACK_VELOCITY_MODIFIER:3000]
   [ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:TOOTH]
      [ATTACK_SKILL:BITE]
      [ATTACK_VERB:bite:bites]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:SECOND]
      [ATTACK_FLAG_CANLATCH]   
   [ATTACK:WHIP:BODYPART:BY_CATEGORY:TENTACLE]
      [ATTACK_SKILL:WHIP]
      [ATTACK_VERB:lash:lashes]
      [ATTACK_CONTACT_PERC:1]
      [ATTACK_PENETRATION_PERC:10]
      [ATTACK_FLAG_CANLATCH]
      [ATTACK_PRIORITY:SECOND]
      [ATTACK_VELOCITY_MODIFIER:5000]   
   
   [DIURNAL]
   [HOMEOTHERM:10067]
   [SWIMS_INNATE][SWIM_SPEED:2500]   

   Rainbow Factory.   
   [REMOVE_MATERIAL:NERVE]
   [USE_MATERIAL_TEMPLATE:NERVE:NERVE_TEMPLATE_ONYX]
   [USE_MATERIAL_TEMPLATE:SPEC_RESIDUE:CREATURE_EXTRACT_TEMPLATE]
      [STATE_NAME_ADJ:ALL_SOLID:frozen twilight residue]
      [STATE_NAME_ADJ:LIQUID:twilight residue]
      [STATE_NAME_ADJ:GAS:boiling twilight residue]
      [STATE_COLOR:ALL:AMBER]
      [DISPLAY_COLOR:6:0:0]
      [PREFIX:NONE]
      [EDIBLE_VERMIN]
      [EDIBLE_COOKED]
      [EDIBLE_RAW]
      [MATERIAL_REACTION_PRODUCT:DRINK_MAT:LOCAL_CREATURE_MAT:SPEC_DRINK]
      [REACTION_CLASS:ONYX_SPECDRINK]
      [MATERIAL_VALUE:5]
   [USE_MATERIAL_TEMPLATE:SPEC_DRINK:CREATURE_ALCOHOL_TEMPLATE]
      [STATE_NAME_ADJ:ALL_SOLID:frozen twilight essence]
      [STATE_NAME_ADJ:LIQUID:twilight essence]
      [STATE_NAME_ADJ:GAS:boiling twilight essence]
      [PREFIX:NONE]
      [MATERIAL_VALUE:10]

   [CASTE:FEMALE]
      [FEMALE]
      [LAYS_EGGS]
         [EGG_MATERIAL:LOCAL_CREATURE_MAT:EGGSHELL:SOLID]
         [EGG_MATERIAL:LOCAL_CREATURE_MAT:EGG_WHITE:LIQUID]
         [EGG_MATERIAL:LOCAL_CREATURE_MAT:EGG_YOLK:LIQUID]
         [EGG_SIZE:4000]
         [CLUTCH_SIZE:2:3]
   [CASTE:MALE]
      [MALE]

   [SELECT_CASTE:ALL]      
      [SELECT_MATERIAL:ALL]
         [MULTIPLY_VALUE:10]

creature_pony_metal_megabeast

[OBJECT:CREATURE]

[CREATURE:AZURE_DESTROYER]
   [DESCRIPTION:A statue of an alicorn, fashioned from living saronite steel and with lava for blood, animated by Dark Voice's power.]
   [NAME:azure destroyer:azure destroyers:azure destroyer]
   [CASTE_NAME:azure destroyer:azure destroyers:azure destroyer]
   [CREATURE_TILE:'A'][COLOR:3:0:1]
   [SEMIMEGABEAST][DIFFICULTY:6]
   [FREQUENCY:90]
   [ATTACK_TRIGGER:60:8000:80000]
   [FANCIFUL]
   [NOPAIN][EXTRAVISION][NOBREATHE][NOSTUN][NONAUSEA][NOEMOTION][NOTHOUGHT][NOEXERT][NO_DIZZINESS][NO_FEVERS]
   [BUILDINGDESTROYER:2]
   [LARGE_PREDATOR]
   [NO_DRINK][NO_EAT][NO_SLEEP]
   [SPHERE:METALS]
   [SPHERE:STRENGTH]
   [SPHERE:WAR]
   [CANNOT_UNDEAD]
   [CANOPENDOORS]
   [NOT_BUTCHERABLE]
   [BIOME:ANY_LAND]
   [UBIQUITOUS]   
   [NOFEAR]   
   [NOBONES]
   [BODY:QUADRUPED_PONY:TAIL:2EYES:2EARS:NOSE:2WINGS:NECK:PONY_MOUTH_LEFT:PONY_HORN:GENERIC_TEETH:EYELIDS:CHEEKS]
   [NO_THOUGHT_CENTER_FOR_MOVEMENT]
   [TISSUE:SARONITE_STEEL]
      [TISSUE_NAME:sarsteel:sarsteel]
      [TISSUE_MATERIAL:INORGANIC:SARONITE_STEEL]
      [VASCULAR:5]
      [MUSCULAR]
      [FUNCTIONAL]
      [STRUCTURAL]
      [RELATIVE_THICKNESS:1]
      [CONNECTS]
      [TISSUE_SHAPE:LAYER]   
   [TISSUE_LAYER:BY_CATEGORY:ALL:SARONITE_STEEL]      
   [BLOOD:INORGANIC:BASALT:LIQUID]
   [BODY_SIZE:0:0:750000]
   [BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
   [BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
   [ATTACK:BITE:BODYPART:BY_CATEGORY:HORN]
      [ATTACK_SKILL:BITE]
      [ATTACK_VERB:stab:stabs]
      [ATTACK_CONTACT_PERC:5]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:MAIN]
   [ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_FRONT]
      [ATTACK_SKILL:STANCE_STRIKE]
      [ATTACK_VERB:kick:kicks]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PRIORITY:MAIN]
      [ATTACK_FLAG_WITH]
   [ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_REAR]
      [ATTACK_SKILL:STANCE_STRIKE]
      [ATTACK_VERB:buck:bucks]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PRIORITY:SECOND]
      [ATTACK_FLAG_WITH]
   [ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:TOOTH]
      [ATTACK_SKILL:BITE]
      [ATTACK_VERB:bite:bites]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:SECOND]
      [ATTACK_FLAG_CANLATCH]
   [NATURAL_SKILL:BITE:5]   
   [NATURAL_SKILL:STANCE_STRIKE:5]   
   [NATURAL_SKILL:MELEE_COMBAT:4]
   [NATURAL_SKILL:DODGING:3]   
   [ITEMCORPSE:STATUE:NO_SUBTYPE:INORGANIC:SARONITE_STEEL]
   [ITEMCORPSE_QUALITY:5]
   [DIURNAL]
   [SWIMS_LEARNED][SWIM_SPEED:2500]

[CREATURE:RAINBOW_ANNIHILATOR]
   [DESCRIPTION:A statue of a blade-alicorn, fashioned from living rainbow metal. The screams of all the ponies murdered by the Dark Voice for the spectra echo in the air around it.]
   [NAME:rainbow annihilator:rainbow annihilators:rainbow annihilator]
   [CASTE_NAME:rainbow annihilator:rainbow annihilators:rainbow annihilator]
   [CREATURE_TILE:'A'][COLOR:3:0:1]
   [MEGABEAST][DIFFICULTY:16]
      [ATTACK_TRIGGER:90:15000:150000]
   [FANCIFUL]
   [NOPAIN][EXTRAVISION][NOBREATHE][NOSTUN][NONAUSEA][NOEMOTION][NOTHOUGHT][NOEXERT][NO_DIZZINESS][NO_FEVERS]
   [BUILDINGDESTROYER:2]
   [LARGE_PREDATOR]
   [NO_DRINK][NO_EAT][NO_SLEEP]
   [SPHERE:METALS]
   [SPHERE:STRENGTH]
   [SPHERE:WAR]
   [CANNOT_UNDEAD]
   [CANOPENDOORS]
   [NOT_BUTCHERABLE]
   [BIOME:ANY_LAND]
   [UBIQUITOUS]   
   [NOFEAR]   
   [NOBONES]
   [BODY:QUADRUPED_PONY:PONY_TYRANID_TWO_SCYTHING_CLAWS:TAIL:2EYES:2EARS:NOSE:2WINGS:NECK:PONY_MOUTH_LEFT:PONY_HORN:GENERIC_TEETH:EYELIDS:CHEEKS]
   [NO_THOUGHT_CENTER_FOR_MOVEMENT]
   [TISSUE:RAINBOW]
      [TISSUE_NAME:rainbow:rainbow]
      [TISSUE_MATERIAL:INORGANIC:RAINBOW]
      [VASCULAR:5]
      [MUSCULAR]
      [FUNCTIONAL]
      [STRUCTURAL]
      [RELATIVE_THICKNESS:1]
      [CONNECTS]
      [TISSUE_SHAPE:LAYER]   
   [TISSUE_LAYER:BY_CATEGORY:ALL:RAINBOW]      
   [BLOOD:INORGANIC:BASALT:LIQUID]
   [BODY_SIZE:0:0:750000]
   [BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
   [BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
   [ATTACK:SLASH:BODYPART:BY_CATEGORY:CLAW]
      [ATTACK_SKILL:GRASP_STRIKE]
      [ATTACK_VERB:slash:slashes]
      [ATTACK_CONTACT_PERC:35]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:MAIN]      
      [ATTACK_VELOCITY_MODIFIER:3000]
   [ATTACK:BITE:BODYPART:BY_CATEGORY:HORN]
      [ATTACK_SKILL:BITE]
      [ATTACK_VERB:stab:stabs]
      [ATTACK_CONTACT_PERC:5]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:MAIN]
   [ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_FRONT]
      [ATTACK_SKILL:STANCE_STRIKE]
      [ATTACK_VERB:kick:kicks]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PRIORITY:MAIN]
      [ATTACK_FLAG_WITH]
   [ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_REAR]
      [ATTACK_SKILL:STANCE_STRIKE]
      [ATTACK_VERB:buck:bucks]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PRIORITY:SECOND]
      [ATTACK_FLAG_WITH]
   [ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:TOOTH]
      [ATTACK_SKILL:BITE]
      [ATTACK_VERB:bite:bites]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:SECOND]
      [ATTACK_FLAG_CANLATCH]
   [NATURAL_SKILL:BITE:5]   
   [NATURAL_SKILL:STANCE_STRIKE:5]   
   [NATURAL_SKILL:GRASP_STRIKE:5]
   [NATURAL_SKILL:MELEE_COMBAT:4]
   [NATURAL_SKILL:DODGING:3]   
   [ITEMCORPSE:STATUE:NO_SUBTYPE:INORGANIC:RAINBOW]
   [ITEMCORPSE_QUALITY:5]
   [DIURNAL]
   [SWIMS_LEARNED][SWIM_SPEED:2500]

[CREATURE:QUEEN_OF_RAINBOWS]
   [DESCRIPTION:This was once a pony, but no more. With a grafted rainbow-metal carapace and two scything claws, this killing machine was set loose by the Dark Voice to spread chaos and devastation.]
   [FEMALE]
   [NAME:Queen of Rainbows:Queen of Rainbows:Queen of Rainbows]
   [CASTE_NAME:Queen of Rainbows:Queen of Rainbows:Queen of Rainbows]
   [CREATURE_TILE:'A'][COLOR:3:0:1]
   [MEGABEAST][DIFFICULTY:20]
      [ATTACK_TRIGGER:90:15000:150000]
   [FANCIFUL]
   [NOPAIN][NOEXERT][NO_DIZZINESS][NO_FEVERS][NOFEAR]
   [BUILDINGDESTROYER:2]
   [LARGE_PREDATOR]   
   [CANNOT_UNDEAD]
   [CANOPENDOORS]   
   [BIOME:ANY_LAND]
   [UBIQUITOUS]         
   
   [BODY:QUADRUPED_PONY:PONY_TYRANID_TWO_SCYTHING_CLAWS:PONY_HORN:2WINGS:TAIL:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:SKULL:PONY_MOUTH_LEFT:GENERIC_TEETH:RIBCAGE:EYELIDS:CHEEKS]   
   
   [TISSUE:RAINBOW_CARAPACE]
      [TISSUE_NAME:rainbow chitin:rainbow chitin]
      [TISSUE_MATERIAL:INORGANIC:RAINBOW]
      [RELATIVE_THICKNESS:1]
      [HEALING_RATE:100]
      [VASCULAR:1]      
      [CONNECTS]
      [CONNECTIVE_TISSUE_ANCHOR]
      [STRUCTURAL]
      [TISSUE_SHAPE:LAYER]
   [TISSUE:RAINBOW_CLAW]
      [TISSUE_NAME:rainbow claw:NP]
      [STRUCTURAL]
      [TISSUE_MATERIAL:INORGANIC:RAINBOW]
      [RELATIVE_THICKNESS:2]
      [HEALING_RATE:1000]
      [CONNECTS]
   [TISSUE:RAINBOW_TOOTH]
      [TISSUE_NAME:rainbow tooth:NP]
      [STRUCTURAL]
      [TISSUE_MATERIAL:INORGANIC:RAINBOW]
      [RELATIVE_THICKNESS:2]
      [CONNECTS]
      [TISSUE_SHAPE:LAYER]
      
   [BODY_DETAIL_PLAN:ZERG_MATERIALS]
   [BODY_DETAIL_PLAN:ZERG_TISSUES]
   [BODY_DETAIL_PLAN:ZERG_TISSUE_LAYERS:RAINBOW_CARAPACE:FAT:MUSCLE:ZERG_BONE:CARTILAGE]   

   [REMOVE_TISSUE:ZERG_NAIL]
   [REMOVE_TISSUE:ZERG_TOOTH]

   [USE_TISSUE:ZERG_NAIL:RAINBOW_CLAW]
   [USE_TISSUE:ZERG_TOOTH:RAINBOW_TOOTH]
   
   [USE_MATERIAL_TEMPLATE:ICHOR:ICHOR_TEMPLATE]
   [BLOOD:LOCAL_CREATURE_MAT:ICHOR:LIQUID]      
   
   [BODY_SIZE:0:0:750000]
   [BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
   [BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]   
   [ATTACK:SLASH:BODYPART:BY_CATEGORY:CLAW]
      [ATTACK_SKILL:GRASP_STRIKE]
      [ATTACK_VERB:slash:slashes]
      [ATTACK_CONTACT_PERC:35]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:MAIN]      
      [ATTACK_VELOCITY_MODIFIER:3000]
      [SPECIALATTACK_INJECT_EXTRACT:LOCAL_CREATURE_MAT:POISON:LIQUID:100:100]
   [ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_FRONT]
      [ATTACK_SKILL:STANCE_STRIKE]
      [ATTACK_VERB:kick:kicks]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PRIORITY:MAIN]
      [ATTACK_FLAG_WITH]
   [ATTACK:KICK:BODYPART:BY_CATEGORY:HOOF_REAR]
      [ATTACK_SKILL:STANCE_STRIKE]
      [ATTACK_VERB:buck:bucks]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PRIORITY:SECOND]
      [ATTACK_FLAG_WITH]
   [ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:TOOTH]
      [ATTACK_SKILL:BITE]
      [ATTACK_VERB:bite:bites]
      [ATTACK_CONTACT_PERC:100]
      [ATTACK_PENETRATION_PERC:100]
      [ATTACK_FLAG_EDGE]
      [ATTACK_PRIORITY:SECOND]
      [ATTACK_FLAG_CANLATCH]
      [SPECIALATTACK_INJECT_EXTRACT:LOCAL_CREATURE_MAT:POISON:LIQUID:100:100]
   [NATURAL_SKILL:BITE:14]   
   [NATURAL_SKILL:STANCE_STRIKE:14]   
   [NATURAL_SKILL:GRASP_STRIKE:14]
   [NATURAL_SKILL:MELEE_COMBAT:14]
   [NATURAL_SKILL:DODGING:10]   

   [USE_MATERIAL_TEMPLATE:POISON:CREATURE_EXTRACT_TEMPLATE]
      [STATE_NAME:ALL_SOLID:frozen rainbow fluid]
      [STATE_ADJ:ALL_SOLID:frozen rainbow fluid]
      [STATE_NAME:LIQUID:rainbow fluid]
      [STATE_ADJ:LIQUID:rainbow fluid]
      [STATE_NAME:GAS:boiling rainbow fluid]
      [STATE_ADJ:GAS:boiling rainbow fluid]
      [PREFIX:NONE]
      [ENTERS_BLOOD]      
      [SYNDROME]
         [SYN_NAME:rainbow shock]
         [SYN_AFFECTED_CLASS:GENERAL_POISON]
         [SYN_IMMUNE_CREATURE:QUEEN_OF_RAINBOWS:ALL]         
         [SYN_CONTACT]
         [SYN_INJECTED]
         [SYN_INHALED]
         [CE_PAIN:SEV:100:PROB:100:LOCALIZED:START:5:PEAK:300:END:500]

   [CAN_DO_INTERACTION:MATERIAL_EMISSION]
       [CDI:ADV_NAME:Breath rainbow fluid]
       [CDI:USAGE_HINT:ATTACK]
       [CDI:BP_REQUIRED:BY_CATEGORY:MOUTH]
       [CDI:MATERIAL:LOCAL_CREATURE_MAT:POISON:TRAILING_VAPOR_FLOW]
       [CDI:TARGET:C:LINE_OF_SIGHT]
       [CDI:TARGET_RANGE:C:15]
       [CDI:MAX_TARGET_NUMBER:C:1]
       [CDI:WAIT_PERIOD:750]   

   [ITEMCORPSE:STATUE:NO_SUBTYPE:INORGANIC:RAINBOW]
   [ITEMCORPSE_QUALITY:5]
   [DIURNAL]
   [SWIMS_LEARNED][SWIM_SPEED:2500]
   [USE_MATERIAL_TEMPLATE:FEATHER:FEATHER_TEMPLATE]   
   [USE_TISSUE_TEMPLATE:FEATHER:FEATHER_TEMPLATE]
   [BODY_DETAIL_PLAN:BODY_PEGASUS_FEATHER_TISSUE_LAYERS]
   [BODY_DETAIL_PLAN:BODY_HAIR_TISSUE_LAYERS:HAIR]
   [SET_TL_GROUP:BY_CATEGORY:ALL:HAIR]
         [TL_COLOR_MODIFIER:DASHAA:1:DASHAB:1:DASHAC:1:DASHAD:1:DASHAE:1:DASHAF:1:DASHAG:1:DASHAH:1:DASHAI:1]
            [TLCM_NOUN:coat:SINGULAR]
      [SET_TL_GROUP:BY_CATEGORY:HEAD:HAIR]
       [PLUS_TL_GROUP:BY_CATEGORY:NECK:HAIR]
         [TL_COLOR_MODIFIER:DASHBA:1:DASHBB:1:DASHBC:1:DASHBD:1:DASHBE:1:DASHBF:1:DASHBG:1:DASHBH:1:DASHBI:1]
            [TLCM_NOUN:hair:SINGULAR]
      [SET_TL_GROUP:BY_CATEGORY:WING:FEATHER]
         [TL_COLOR_MODIFIER:DASHCA:1:DASHCB:1:DASHCC:1:DASHCD:1:DASHCE:1:DASHCF:1:DASHCG:1:DASHCH:1:DASHCI:1]
            [TLCM_NOUN:wings:PLURAL]
      [SET_TL_GROUP:BY_CATEGORY:EYE:EYE]
         [TL_COLOR_MODIFIER:IRIS_EYE_TAUPE_ROSE:1]
            [TLCM_NOUN:eyes:PLURAL]   

[Meph]

I just read this in a realted thread about the issue (have the same crashes with megabeasts) and someone posted this solution:

[BIOME:ANY_LAND] and [SEMIMEGABEAST] causes crashes. Change the biome tags and it should be fine. UNTESTED.

Hope it helps.