Dragon Age - Arcane Warrior sustainables?

Sounds workable. Although you may want to make sure you have enough hitpoints (i.e. Constitution) for your blood magic. And it would also be useful to memorize which spells can be cast without sheathing your weapon. Sure, you can have a different weapon set (a staff I presume?) when you want to go spellcasting, but personally, I don't care for the extra micromanagement required. Also, if you're going to be switching from a melee tank to a ranged caster now and then, you might want to bring a backup tank. Just another thing you might want to consider.