I wanted to reduce the amount of useful and valuable things the goblins dump in my fortress. I decided to give them [WOOD_PREF] so they wouldn't be my largest source of metal while still being able to have some equipment.
But it didn't work. In the first goblin attack they brought weapons and armour of copper, bronze, bismuth bronse, iron, steel and even one silver and one adamantine maul, i.e. all metals that can be used for weapons and armour.
Does anyone know why? Here's their entity entry:
[ENTITY:EVIL]
[CREATURE:GOBLIN]
[trANSLATION:GOBLIN]
[DIGGER:ITEM_WEAPON_PICK]
[WEAPON:ITEM_WEAPON_WHIP]
[WEAPON:ITEM_WEAPON_AXE_BATTLE]
[WEAPON:ITEM_WEAPON_HAMMER_WAR]
[WEAPON:ITEM_WEAPON_SWORD_SHORT]
[WEAPON:ITEM_WEAPON_SPEAR]
[WEAPON:ITEM_WEAPON_MACE]
[WEAPON:ITEM_WEAPON_CROSSBOW]
[AMMO:ITEM_AMMO_BOLTS]
[WEAPON:ITEM_WEAPON_BOW]
[AMMO:ITEM_AMMO_ARROWS]
[WEAPON:ITEM_WEAPON_PIKE]
[WEAPON:ITEM_WEAPON_HALBERD]
[WEAPON:ITEM_WEAPON_SWORD_2H]
[WEAPON:ITEM_WEAPON_SWORD_LONG]
[WEAPON:ITEM_WEAPON_MAUL]
[WEAPON:ITEM_WEAPON_AXE_GREAT]
[WEAPON:ITEM_WEAPON_DAGGER_LARGE]
[WEAPON:ITEM_WEAPON_SCOURGE]
[WEAPON:ITEM_WEAPON_FLAIL]
[WEAPON:ITEM_WEAPON_MORNINGSTAR]
[WEAPON:ITEM_WEAPON_SCIMITAR]
[ARMOR:ITEM_ARMOR_PLATEMAIL:UNCOMMON]
[ARMOR:ITEM_ARMOR_CHAINMAIL:UNCOMMON]
[ARMOR:ITEM_ARMOR_LEATHER:UNCOMMON]
[HELM:ITEM_HELM_HELM:UNCOMMON]
[HELM:ITEM_HELM_CAP:RARE]
[HELM:ITEM_HELM_MASK:UNCOMMON]
[GLOVES:ITEM_GLOVES_GAUNTLETS:UNCOMMON]
[GLOVES:ITEM_GLOVES_GLOVES:RARE]
[SHOES:ITEM_SHOES_SHOES:RARE]
[SHOES:ITEM_SHOES_BOOTS:UNCOMMON]
[SHOES:ITEM_SHOES_BOOTS_LOW:UNCOMMON]
[SHOES:ITEM_SHOES_SANDAL:RARE]
[SHOES:ITEM_SHOES_SOCKS:RARE]
[PANTS:ITEM_PANTS_PANTS:RARE]
[PANTS:ITEM_PANTS_GREAVES:UNCOMMON]
[PANTS:ITEM_PANTS_LEGGINGS:UNCOMMON]
[PANTS:ITEM_PANTS_LOINCLOTH:UNCOMMON]
[SHIELD:ITEM_SHIELD_SHIELD]
[SHIELD:ITEM_SHIELD_BUCKLER]
[SIEGEAMMO:ITEM_SIEGEAMMO_BALLISTA]
[TOY:ITEM_TOY_AXE]
[trAPCOMP:ITEM_TRAPCOMP_GIANTAXEBLADE]
[trAPCOMP:ITEM_TRAPCOMP_ENORMOUSCORKSCREW]
[trAPCOMP:ITEM_TRAPCOMP_SPIKEDBALL]
[trAPCOMP:ITEM_TRAPCOMP_LARGESERRATEDDISC]
[trAPCOMP:ITEM_TRAPCOMP_MENACINGSPIKE]
[INSTRUMENT:ITEM_INSTRUMENT_DRUM]
[CLOTHING]
[CURRENCY:COPPER:1]
[CURRENCY:SILVER:5]
[CURRENCY:GOLD:15]
[SELECT_SYMBOL:WAR:NAME_WAR]
[SUBSELECT_SYMBOL:WAR:VIOLENT]
[SELECT_SYMBOL:BATTLE:NAME_BATTLE]
[SUBSELECT_SYMBOL:BATTLE:VIOLENT]
[SELECT_SYMBOL:SIEGE:NAME_SIEGE]
[SUBSELECT_SYMBOL:SIEGE:VIOLENT]
[SELECT_SYMBOL:ROAD:NAME_ROAD]
[SELECT_SYMBOL:TUNNEL:NAME_TUNNEL]
[SELECT_SYMBOL:BRIDGE:NAME_BRIDGE]
[SELECT_SYMBOL:WALL:NAME_WALL]
[SELECT_SYMBOL:REMAINING:EVIL]
[CULL_SYMBOL:ALL:DOMESTIC]
[CULL_SYMBOL:ALL:FLOWERY]
[CULL_SYMBOL:ALL:HOLY]
[CULL_SYMBOL:ALL:PEACE]
[CULL_SYMBOL:ALL:NEGATOR]
[CULL_SYMBOL:ALL:GOOD]
[STONE_PREF]
[WOOD_PREF]
[USE_CAVE_ANIMALS]
[USE_EVIL_ANIMALS]
[USE_EVIL_PLANTS]
[USE_EVIL_WOOD]
[USE_ANIMAL_PRODUCTS]
[USE_MISC_PROCESSED_WOOD_PRODUCTS]
[EQUIPMENT_IMPROVEMENTS]
[ABUSE_BODIES]
[SPHERE_ALIGNMENT:WAR:512]
[ART_FACET_MODIFIER:GOOD:0]
[ART_FACET_MODIFIER:EVIL:512]
[FRIENDLY_COLOR:5:0:1]
[DEFAULT_SITE_TYPE:DARK_FORTRESS]
[liKES_SITE:DARK_FORTRESS]
[TOLERATES_SITE:DARK_FORTRESS]
[CAN_HAVE_MILITARY_SITE_LEADER]
[START_BIOME:MOUNTAIN]
[BIOME_SUPPORT:ANY_WETLAND:1]
[BIOME_SUPPORT:ANY_DESERT:1]
[BIOME_SUPPORT:ANY_FOREST:2]
[BIOME_SUPPORT:ANY_OCEAN:1]
[BIOME_SUPPORT:ANY_LAKE:1]
[BIOME_SUPPORT:MOUNTAIN:3]
[BIOME_SUPPORT:ANY_GRASSLAND:1]
[BIOME_SUPPORT:ANY_SAVANNA:1]
[BIOME_SUPPORT:ANY_SHRUBLAND:1]
[BIOME_SUPPORT:ANY_RIVER:1]
[PROGRESS_TRIGGER_POPULATION:2]
[PROGRESS_TRIGGER_PRODUCTION:2]
[PROGRESS_TRIGGER_TRADE:2]
[ACTIVE_SEASON:SPRING]
[ACTIVE_SEASON:SUMMER]
[ACTIVE_SEASON:AUTUMN]
[ACTIVE_SEASON:WINTER]
[MAX_STARTING_CIV_NUMBER:100]
[START_GROUP_NUMBER:10]
[MAX_POP_NUMBER:10000]
[MAX_SITE_POP_NUMBER:120]
[RELIGION:ANY_APPROPRIATE_POWER]
[BEAST_HUNTER]
[SCOUT]
[PERMITTED_JOB:MINER]
[PERMITTED_JOB:CARPENTER]
[PERMITTED_JOB:BOWYER]
[PERMITTED_JOB:WOODCUTTER]
[PERMITTED_JOB:ENGRAVER]
[PERMITTED_JOB:MASON]
[PERMITTED_JOB:ANIMAL_CARETAKER]
[PERMITTED_JOB:ANIMAL_TRAINER]
[PERMITTED_JOB:HUNTER]
[PERMITTED_JOB:TRAPPER]
[PERMITTED_JOB:ANIMAL_DISSECTOR]
[PERMITTED_JOB:FURNACE_OPERATOR]
[PERMITTED_JOB:WEAPONSMITH]
[PERMITTED_JOB:ARMORER]
[PERMITTED_JOB:BLACKSMITH]
[PERMITTED_JOB:METALCRAFTER]
[PERMITTED_JOB:GEM_CUTTER]
[PERMITTED_JOB:GEM_SETTER]
[PERMITTED_JOB:WOODCRAFTER]
[PERMITTED_JOB:STONECRAFTER]
[PERMITTED_JOB:LEATHERWORKER]
[PERMITTED_JOB:BONE_CARVER]
[PERMITTED_JOB:WEAVER]
[PERMITTED_JOB:CLOTHIER]
[PERMITTED_JOB:GLASSMAKER]
[PERMITTED_JOB:FISHERMAN]
[PERMITTED_JOB:FISH_DISSECTOR]
[PERMITTED_JOB:FISH_CLEANER]
[PERMITTED_JOB:COOK]
[PERMITTED_JOB:BUTCHER]
[PERMITTED_JOB:TANNER]
[PERMITTED_JOB:DYER]
[PERMITTED_JOB:HERBALIST]
[PERMITTED_JOB:BREWER]
[PERMITTED_JOB:LYE_MAKER]
[PERMITTED_JOB:WOOD_BURNER]
[PERMITTED_JOB:MECHANIC]
[PERMITTED_JOB:SIEGE_ENGINEER]
[PERMITTED_JOB:SIEGE_OPERATOR]
[PERMITTED_JOB:PUMP_OPERATOR]
[PERMITTED_JOB:TRADER]
[PERMITTED_JOB:ARCHITECT]
[WORLD_CONSTRUCTION:TUNNEL]
[WORLD_CONSTRUCTION:BRIDGE]
[ETHIC:KILL_ENTITY_MEMBER:PERSONAL_MATTER]
[ETHIC:KILL_NEUTRAL:ACCEPTABLE]
[ETHIC:KILL_ENEMY:ACCEPTABLE]
[ETHIC:KILL_ANIMAL:ACCEPTABLE]
[ETHIC:KILL_PLANT:ACCEPTABLE]
[ETHIC:TORTURE_AS_EXAMPLE:ACCEPTABLE]
[ETHIC:TORTURE_FOR_INFORMATION:ACCEPTABLE]
[ETHIC:TORTURE_FOR_FUN:ACCEPTABLE]
[ETHIC:TORTURE_ANIMALS:ACCEPTABLE]
[ETHIC:TREASON:PUNISH_CAPITAL]
[ETHIC:OATH_BREAKING:PERSONAL_MATTER]
[ETHIC:LYING:PERSONAL_MATTER]
[ETHIC:VANDALISM:PERSONAL_MATTER]
[ETHIC:TRESPASSING:PERSONAL_MATTER]
[ETHIC:THEFT:PERSONAL_MATTER]
[ETHIC:ASSAULT:PERSONAL_MATTER]
[ETHIC:SLAVERY:PERSONAL_MATTER]
[ETHIC:EAT_SAPIENT_OTHER:PERSONAL_MATTER]
[ETHIC:EAT_SAPIENT_KILL:PERSONAL_MATTER]
[ETHIC:MAKE_TROPHY_SAME_RACE:ACCEPTABLE]
[ETHIC:MAKE_TROPHY_SAPIENT:ACCEPTABLE]
[ETHIC:MAKE_TROPHY_ANIMAL:ACCEPTABLE]
I also removed [SUBTERRANEAN_CLOTHING] so they wouldn't use giant cave spider silk, but they did anyway. I removed [BABYSNATCHER] and in their creature entry I changed [INTELLIGENT] to [CAN_CIV][CAN_LEARN] so they'd attack more often.
I've also added snailmen and leechmen civilizations, but I don't see how that could have caused this.