Just wondering, instead of using sleep, would it be viable to use DR and just stand there while using ToW while TR keeps them petrified? It seems safer, since each pulse of the trance wouldnt wake up everything, and you could even use Spirit's Necrosis to reduce resists farther...In addition to finding staves to increase energy regen and -recharge, using Spirit's Dark Covenant for more energy, and the Nightmare can benefit from the -vitality resists. Plus its a focused mage build, making gear and Int more specialized. Or am I missing an element somewhere?
Edit: Forgot about the Lich's reducing resists as well