That was the black heart, related to the darkness. Read the mysteries 1 Grimoire as it states the darkness stands alone, If you infer the way I did
English
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Well whatever it is I EXTREMELY doubt it's stronger than really anything in borderlands.
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We don't know yet. I made this post, I am pretty new to borderlands, and I think borderlands, even though I think I know more about destiny the almost 90% of any other player. Lore not skill or strategy