Heal in shroud is to OP (lifeleech will heal you in shroud)you can easy tank Wing 1-4 with Necromancer (in other Wings i dont know)the problem is when 2 traits belong together but are in the grand master trait
Again the necromancer loses a support option = /bye bye protection for allies = (welcome to Grand Master property useless blood bankHow should one turn healing into barrier when healing is also a Grand Master trait?