If you think about it, they kinda do have aspects of healers in both titan defender and Warlock sunsinger. Titan bubble can give anyone a over shield for a temporary time limit. Warlock sunsinger has a perk that cools down abilities quickly, but the problem is most of warlocks run self revive.
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I think they should replace the fire born perk, it essentially forces the use of it, I fall victim to it as well.