Witchcraft has basically 1 spell (causes 1000 crushing damage on target) not sure what else you'd call end-game spell for witchraft... resurrection is neat, but I barely if ever died. And it needs just as many AP as the scroll, even with 26 INT
So basically, Witches don't have a tactical nuke. ^^
The witchcraft spell is also touch range.
High level WC spells should be Void spells, IMHO.