I like the idea of a DPS spec that embodies the idea of a fanatical zealot where the ends justify the means as long as "evil" is defeated
The spec name could be Inquisitor or purifier something like that maybe?
They could wear cloth and chain mail, with a primary focus on crowd control debuffs and DoT damage. It could function similer to a hybrid of classic ranger and mage.
It would be interesting to see it weild a firearm and melee weapon with an emphasis on special ammo/ elixirs and poisons. Think "blessed silver bullets" or coating the blade of a sword with Demon blood for fire DPS on hit.
It's cool, reminds me on the witch hunter from warhammer franchise. But obviously instead of wearing leather and cloth (and hat) of the witch hunter, he can wear plate. Like a holy "turret" character.