Beast Arm: Black Bull

Beast Arm: Black Bull (ビーストアーム黒牛 Bīsuto Āmu Kokugyū)Fairy Tail Zeref Awakens is a Beast Soul Spell.
==Description==
The user transforms their right arm into a large black arm of an unknown beast that increases the power of their punches.Fairy Tail Manga: Chapter 55, Pages 4-5
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