Well I mean without self-Rez would warlocks really be valuable? ;)
[spoiler]yes they would. Just like a hunter with invis and quickness and murder sprees are crucially valuable or a titan and their tankiness and bubble. I'd actually appreciate a warlock using the skill that reduces cool downs but nope only self-Rez. [/spoiler]
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The problem is if we don't use sun singer you can't find a good time to use it or when you activate it near death you don't heal or anything as well you have to reload your gun if u used it. If we had something like upon activating your super you get max health most of us wouldn't be using fireborn.