Building on the whole "interactions pass on syndromes pass on interactions" mechanic, one might make creatures with body mats that bestow interactions through a contact/ingestion syndrome - i.e. you could have a "Wand of Fireball" by wielding a Fire Salamander bone, or you could turn the bones into a ring and have a Ring of Fireball, or you could drink its blood to throw the fireballs for a brief time.
This makes Nethack-style intrinsic effects from eating creatures a possibility.
Re: novel webs, the Wisdom secret has a basic mat web that's a bit different. It trips the target up but quickly melts into puddles of "water laced with water" which is odd, since it implies each web has its own material source, like creatures do with their blood.
[CE_CAN_DO_INTERACTION:START:0]
[CDI:ADV_NAME:Ice Web]
[CDI:USAGE_HINT:ATTACK]
[CDI:INTERACTION:MATERIAL_EMISSION]
[CDI:MATERIAL:WATER:WEB_SPRAY]
[CDI:TARGET:C:LINE_OF_SIGHT]
[CDI:TARGET_RANGE:C:10]
[CDI:MAX_TARGET_NUMBER:C:1]
[CDI:WAIT_PERIOD:50]
The quick cooldown needs to be altered. I'll continue to science.
In the meanwhile I went a bit daft and made some Cheese interactions in preparation for the SPHERE:FOOD secret. These can be pasted into a creature raw for instant access to the cheesy wonder. The cheese webs dissolve into melted cheese after tripping the targets, a few webs get left behind and melt when collected.
[USE_MATERIAL_TEMPLATE:CHEESE:CREATURE_CHEESE_TEMPLATE]
[STATE_ADJ:ALL_SOLID:cheese]
[STATE_ADJ:LIQUID:cheese]
[STATE_NAME:GAS:cheese smoke]
[STATE_ADJ:GAS:cheese smoke]
[DISPLAY_COLOR:6:0:1]
[EDIBLE_VERMIN]
[EDIBLE_RAW]
[EDIBLE_COOKED]
[USE_MATERIAL_TEMPLATE:MOLTEN_CHEESE:CREATURE_CHEESE_TEMPLATE]
[STATE_ADJ:ALL_SOLID:cheese]
[STATE_ADJ:LIQUID:cheese]
[STATE_NAME:GAS:cheese smoke]
[STATE_ADJ:GAS:cheese smoke]
[DISPLAY_COLOR:6:0:1]
[MELTING_POINT:10000]
[EDIBLE_VERMIN]
[EDIBLE_RAW]
[EDIBLE_COOKED]
[CAN_DO_INTERACTION:MATERIAL_EMISSION]
[CDI:ADV_NAME:Hurl cheese]
[CDI:USAGE_HINT:ATTACK]
[CDI:BP_REQUIRED:BY_CATEGORY:HAND]
[CDI:MATERIAL:LOCAL_CREATURE_MAT:CHEESE:SOLID_GLOB]
[CDI:VERB:throw a piece of cheese:throws a piece of cheese:NA]
[CDI:TARGET:C:LINE_OF_SIGHT]
[CDI:TARGET_RANGE:C:15]
[CDI:MAX_TARGET_NUMBER:C:1]
[CDI:WAIT_PERIOD:60]
[CAN_DO_INTERACTION:MATERIAL_EMISSION]
[CDI:ADV_NAME:Hurl molten cheese]
[CDI:USAGE_HINT:ATTACK]
[CDI:BP_REQUIRED:BY_CATEGORY:HAND]
[CDI:MATERIAL:LOCAL_CREATURE_MAT:CHEESE:LIQUID_GLOB]
[CDI:VERB:throw a glob of cheese:throws a glob of cheese:NA]
[CDI:TARGET:C:LINE_OF_SIGHT]
[CDI:TARGET_RANGE:C:15]
[CDI:MAX_TARGET_NUMBER:C:1]
[CDI:WAIT_PERIOD:60]
[CAN_DO_INTERACTION:MATERIAL_EMISSION]
[CDI:ADV_NAME:Hurl strings of sticky cheese]
[CDI:USAGE_HINT:ATTACK]
[CDI:MATERIAL:LOCAL_CREATURE_MAT:MOLTEN_CHEESE:WEB_SPRAY]
[CDI:VERB:spray strings of cheese:sprays strings of cheese:NA]
[CDI:TARGET:C:LINE_OF_SIGHT]
[CDI:TARGET_RANGE:C:10]
[CDI:MAX_TARGET_NUMBER:C:1]
[CDI:WAIT_PERIOD:90]
If you are curious, thrown cheese is in fact deadly.
There's no hardcoded lightning, but by adding it as an inorganic mat you could make regional lightning storms and such. I don't know any way to do lightning besides a custom material, but a modded flame template works in a pinch. The visibility of fire and lightning comes from hot and ionized gases, so it may help to think of the materials as those gases and not the combustion / electrical discharge itself.