Currently a bug where Doom Fang's won't give any Super energy on charged melee kills.. I constantly have to unequip and reequip them for it to resume working but sometimes it still doesn't fix the issue.
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it's the new ornament....it's bugged. You can either not use that ornament for now or do what i do and after you get your super and use it unequip/re-equip doomfang and it's all good.