So your plan is for the Nocturnal AST with the SCH to ignore half of their skills.. That is ludicrous. Benefic 2 in Nocturnal is 651 potency while it is 620 in Diurnal, but casts 5% faster. It ends up being the same overall. You can't just continue to ignore the spell speed granted by Diurnal and you cant ask a Nocturnal AST to ignore half of their heals. That in itself ruins the validity of any argument this could ever have of being viable.