Well chalk up 4 more deaths

The DM threw an arguably unfair combat at us and we ended up dying, heh guess i should be more careful about what i wish for.
For those curious Session went as so:
Level 11 - Avenger, Paladin, Wizard, Psion vs Vampire Muse and 2 wraiths (uncertain what type) - note we should've had a wrathful invoker and another wizard but they were both out of town
after the fight we are informed we cannot rest, but we get the hp and hs as if we had spent an extended rest
We skip a skill challenge (due to not recognizing it as important) which would have allowed us to rest
run across 4 skull lords, 4 ghoul minions, 25 minions all of which are finishing a ritual. upon entering the ritual completes, 2 oblivion wraiths appear and each kills a minion
throughout the fight we killed off the ghoul minions 3-4 times, 5 oblivion wraiths (due to their spawning) all the cultist minions and 1 skull lord
It was actualy a 3ish way fight, us vs wraiths and cultists, cultists vs us, and wraiths vs both.