Have just started playing the game, EE version.

How do I use melee characters together with AOE effects? Let´s say I spread and set fire to oil on the ground in order to slow and burn an enemy. I´m assuming that any melee character I send there to hit the enemy will also catch fire, so that´s not a bright idea?

Melee vs enemies that burn or have other states(?) is OK as long as there is no terrain AOE effect going on?

So AOE should be used to cc and attack areas that are away from any of my melee characters? Just want to be sure I´m not missing something, like the possibility for my characters to somehow be immune to AOE effects that my other characters are tossing around. :)