This is just an ideea for new in-game…stuff.
I feel like Fire and Lighning Dmg should ignite poison/acid dmg - so if u poisoned an enemy and u dmg it with fire, he starts to burn, getting burn dmg…
Also when u enter a room with poison gas, or poison liquid on groun - if u use fire/light dmg u can start a fire on the ground and explode the gas for new damage.
Pierce dmg should penetrate the armor/skin making any dmg more inflicting and dangerous. It should not be a stand-alone dmg - so like 100% pierce dmg should be +25% all other dmgs.
Chaos should enrage all dmg types and make them very powerfull from time to time. Every 100% chaos dmg gives higher chance for crit hits.
Aetheral dmg should fuse with any and somehow add to its power. It should fuse with ur highest dmg type except except it, and add to that half of it.
So if ur highest dmg is 1500% Fire and u have 500% aether - 250% should stack on 1500% for 1750% total Fire.
Also cold and fire should cancel eachother out - so if u freeze an enemy and attack with fire - u do no dmg - u just unfreeze it and dmg after. If and enemy is burning - cold dmg would cancel the burn.
U get the ideea - more realistic - but also more fun, more diversity, more party builds decisions, NEW ONES.