1. sleep creature
2. cast Inner Demons
3. wait for some inner demons to appear (and summon anything else you can)
4. cast Dream Prison
5. regeneration infusion
the creature can't escape sleep, because of Dream Prison, and then your summoned creatures attack it endlessly! your psi keeps up through the regen infusion.
I am still experimenting to see how effective this is, but so far, it has proven very effective
