How to beat Late Age Ermor?

[Alderanas]

ok so the consensus is to use communion? I love fighting LA ermor but they always beat the crap out of me. Is communion the spell that lets one mage use all the other mages on the battle fields power?

[Alderanas]

one other question that i have. Do burden of time and foul air effect lifeless creatures the same as they would an undead creature?

[Alderanas]

I am not really sure i have ever used communion. my usual tactic is to overwhelm my opponents with lots of powerful soldiers and many different types of mages spewing as many different deadly spells as possible.