lava realm

CONTEXT? POSSIBLY A GOOD IDEA, SO:

otilu and I are keen on the idea of an AU where i) Casey is not fridged ii) Billy is Strange's apprentice iii) the universe got destroyed and now Strange, Casey, Billy and Wong travel through dimensions in the remains of Strange's Sanctum Sanctorum (a few dimensionally displaced rooms where a lot of the doors just lead to pits of tentacles and screaming), seeking the key to restoring their reality
and it's more or less ridiculous magic Doctor Who.