Azel's Godhand, also known as the Devil Hand, is Azel's left arm and one half of the legendary Godhands, the other being Gene's Godhand, the Right God Hand. After betraying the Godhand clan, Azel takes one of the legendary God Hands from Olivia for himself. This Godhand manifests itself as a tattooed arm whose power Azel can tap into at will.
The Left Hand of God - Wikipedia
Too bad we will never get an answer for the past God Hand : r/Berserk
Left Godhand, God Hand Wiki
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God Hand
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Left Godhand, God Hand Wiki
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What are the abilities of the God Hand in Berserk? - Quora