[Twan]

Personnally my solution would be endgame non-SC summons casting powerful battle spells with the #onebatllespell command.

In the spell mod I'm (very slowly) developping, the endgame summons will be spirits with stats like that :

Spirit of Dreams (endgame air summon) hp and all stat (except MR) = 5, only 2 misc slots, but is a true ethearal and has a onebatllespell combining effects of Fog Warriors and a mass Confusion affecting 25% of the squares, also has two precision 100 long range attacks one with aoe 10 false fetters and one with aoe 10 confusion ; out of combat can call phantom beasts and domsummon/summon (a lot of) phantasmal warriors.