Ermor?

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quantum_mechani said:
You are not using enough, else ermor is using more powerful undeads than thier normal freespawns. Level 2 priests are ideal banishers- partiularly Man's which are almost half price.

I somewhat disagree : Banishment is largely level-dependent, and if you manage to have lvl 3+ priests they are much more effective.
However, in the case of Man they're just not available : so I'd advice to rather back the priests with bowmen and Air mages, for WG sure but also for lightning (LB, OB, TS) spells. To top it off add a dose of Bards for soothing songs