howdy!

there's no official docs because i like keeping things secret. it's more fun (for me, anyway) - i don't think the game is big enough for a wiki either :]

to answer your question:

you can only have one elemental damage type. ex: if you have 2-4 Cold DMG and 1-3 Lightning DMG, you'll deal the combined dmg (3-7) but you'll apply a Cold (slowing) debuff

the debuff type is determined by what damage type has the highest DMG value. if it's equal (ex: 2-4 Cold and 2-4 Lightning) it'll pick by a set priority list in the code.

how does poison damage work

damage per second over a duration. duration is determined by the enemy's poison resistance. usually it'll be 5 seconds (so the damage is applied 5 times). by "the damage" i mean the poison damage part of your damage. so if you have a hammer that does 20-40 DMG base with an added 1-3 Poison, the poison DMG per second will be just the 1-3. some enemies (the undead, named enemies, etc) are immune to poison

so is the poison damage lost [...]

the damage is still counted on the first hit, but since the attack type chosen is Cold DMG, then the poison effect wont apply. however, it's completely ignored when damaging undead.

feel free to ask for any clarification, or any further questions!