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The GeoGrey Sword is a unique weapon belonging to ShineGreymon. In Digimon Data Squad, it is summoned by Marcus' D.N.A, and appears in a flash of flames. Its design seems to be based on the Crest of Courage.
Digimon Data Squad
The sword first appears while ShineGreymon is battling BioDarkdramon in the city, in response to Marcus and ShineGreymon's need to fight without causing collateral damage. ShineGreymon continues to use it in every battle, but when he begins fighting the Royal Knights and King Drasil, they are frequently able to effortlessly disarm him, and it is even broken twice, by Craniamon and King Drasil, and it is also broken by Argomon in Ultimate Power! Activate Burst Mode!!. Every time the sword is broken, ShineGreymon proceeds to utilise his more powerful Burst Mode instead.