Critical Damage and Critical Chance are different from Elemental Critical Chance. also Weapon DMG% and Weapon DMG+ only work for the Weapon they are on, where as Elemental DMG% and Elemental DMG+ work with any Weapon of the same Element and can be on any item or Pet. also, Elemental Crit Chance is different from Elemental Crit Damage.
Elemental Crit Chance can cause Immolate for Fire, Freeze for Ice, Paralyze for Shock, Orbit for Arcane, and Toxic for Poison.
Elemental Crit Damange increases the damage done by the effects of Elemental Crit Chance. Blistering gives +100% Bleed to Immolated, Celestial gives +100% DMG for Orbit, Blight gives +100% DMG to Toxic, Frostbiting gives +100% DMG to Freeze, and High Voltage gives +100% DMG to Paralyzed.
Also, I thought Prismatic, if triggered, would forcibly change the element type to the one element the target is weakest to, but I guess I’m wrong there too. That was the main reason I was considering to go for Prismatic.
Prismatic is totally random. there is a Ring Mythic Affix called Effective that kind of works this way. it doesn’t really change your attacks Element, but during the damage part of the battle, it will consider your attack to be the targets weakness for +25% DMG. if the target is immune to it’s own Element, then you lose the benefit of Effective. but if you have +90% or more of Weaken, you are good to go.
when you look at damage, WD% is considered first, then WD+, ED%, & ED+, in this order. if you want a better look on how damage works, here is a good post that might help.