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'''Berserk Mode''' is an unofficial term used to refer to the state of mind that [[Yuya]], [[Yuto]], and [[Yugo]] occasionally enter.

==Effects==

This ability causes Yuya and his dimensional counterparts to go into a state of rage, and their eyes to glow. This usually occurs in a Duel invoking the [[Four Dimension Dragons]] or taking one's mind. While they are in Berserk Mode, they are willing to harm or destroy their opponent in order to win the Duel. When they regain their senses, they generally have no knowledge of what happened while they were in Berserk Mode.<ref name="ep37">{{episode|Yu-Gi-Oh! ARC-V|37|ref}}</ref><ref name="ep39">{{episode|Yu-Gi-Oh! ARC-V|39|ref}}</ref> It first appeared during the Duel between Yuto and Yugo. When Yuto [[Xyz Summon]]ed his "[[Dark Rebellion Xyz Dragon]]" and Yugo [[Synchro Summon]]ed his "[[Clear Wing Synchro Dragon]]" their eyes glowed (Yuto's eyes glowed purple while Yugo's were green). After being reminded that he didn't want to hurt anyone by Yuya, Yuto came out of Berserk Mode, but then lost to Yugo a moment later.<ref name="ep37" />

Later in his Duel against [[Isao Kachidoki]], Yuto appeared in Yuya's mind and the two merged, causing Yuya to enter Berserk Mode and use Yuto's "Dark Rebellion Xyz Dragon" to win the Duel. When Yuya regained his senses, he was met with concerned glares from the audience and disdain from Isao. <ref name="ep39" />

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