Lets see...Self rez when the rest of the team is dead. Prevents the wipe and while you are burning with the force of a thousand suns and respawning your dead team,the moment they pop back into existance radiance is now reducing the cooldown times on all of their abilities as well. Sounds like a pretty damn supportive roll to me. Flame shield from melee attacks and if there is a smart titan in the group then a bubble shield will be coming down shortly from all the melee orbs I just dropped for him to further aid the team and get us back on track.