Arguably bubble + weapons of light + illuminated will give more boss damage than any other class super, plus provide a safe haven for your group. Nothing about a titan precludes them from being "support", though that really doesn't even make sense to me, I prefer fist of havoc(it's like being Thor plus guns) but some hunters prefer bladedancer, they can't use that on the boss either so they either suck it up, kill adds with it, or use gunslinger. We have the same option, but with defender subclass and using your talents to optimal effect.