a chain contingency "see enemy" on a cleric mage could unleash 3 bolts of glory, possibly a good start. maybe "last hit by" could be more specific. sequenced "doom" spells would raise his saving throws by 2 for each spell, a cast time of one, no save... you would need to be very high in level, but other cleric quest spells would be great, along with summoned deva or planetar.... those globe of blades/flaming aura spells deal some good damage. spell trigger could hold lower resist/lower resist/feeblemind. critically, look for spells that deal high damage with no save or low save..
bring in some high level items from soa, such as ring of kangaxx, staves of magi, and summon elemental(fire is unlimited charges in the same battle, very handy) havent tried yet but soon.. soon.