yes, mana clash is nearly the only active spell i use, as a battle opener,
to instant kill the only foes that can actually inflict damage on AW, -mages.
It is conveniently in the same line as spell might that boost spellpower, which i use to boost flaming weapons with.
spell wisp & might also boost rock armor up to a point, up to around 50 magic or so IIRC.
For several reasons, BM is the only complementary specialization for the AW for me,
firstly, i play on PC, so i'm bound to use Cailens stuff for regenerations, and the armor regenerate 5 life, in spite of blood magic activator
secondly i play solo, so why bother with SH, and i will always be a better tank than SS since i got sustainables
thirdly i don't waste a single point in willpower, i rely on armor mana pool until high levels provide sufficient mana pool