Beast Arm: Iron Bull

Beast Arm: Iron Bull (ビーストアーム鉄牛 Bīsuto Āmu Tetsugyū)Fairy Tail Zeref Awakens is a Beast Soul Spell.
==Description==
The user transforms their arm into a large metal fist, thereby increasing their punching power.Fairy Tail Manga: Chapter 55, Page 7 In some instances, instead of their arm, the user's tail changes form.Fairy Tail Anime: Episode 71
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