If a voidwoken dies, he leaves behing this deceasing stuff (not sure the correct name at the moment). It is highly flammable like poison and if put ablaze it creates necrofire instead of normal fire.
Knowing this fact, make is pretty easy to make the Voidwoken waves to pretty much kill themselves.
Not sure what is your big deal with oil. Sure, is surpasses protecting, but the slow will never be the reason to lose. Thanks to magic armor, electric and burning surfaces are less of a threat than in D:OS 1. If you have enough magic armor, you can walk through them with out any care. In D:OS 1 you always needed to avoid them, if you weren't immune. If your team isn't grouped up, oil will often only affect one or two of your members and there are skill to counter it anyway like Haste. The big problem about the crocodiles was never the oil, it was the teleport, the heavy bite attack and the chance of getting feared, with hardly any magic armor to be protected of fear.
Fighting the salamanders my friend and I even trolled each other an teleported our characters in front of those beasts, and still won the fight with ease. Also because some times enemies just run away instead of attacking, out of no obvious reason. AI feels even more flawed after the latest patch.
Also neither A nor B have any kind of fire attack for themselves, C for sure has and D not sure.
My main issue at the moment is: Magic attack themselves feel so weak, that withling down all the magic armor is pretty hard, if you have only one real mage in team and without poison-fire-explosions.
