Fireborn is a gimmick.
With a full super, Fireborn Sunsingers should get a buff to damage, similar to Weapons of Light.
That single change might fix this broken subclass.
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I've seen some ignorance in my days but you my dear Warlock Crutch Class Main, have no idea how balance works. Have you ever considered to just gaining some skill or learning how to -blam!-ING aim?