Tyrannorot's signature weapon. It is a sword that has the sharpness and bite force of Tyrannosaurus Rex.

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Being a sword with such power, Rexcalibur is the strongest melee weapon of all, and it can cut through bone and leaving serious marks on harder surfaces such as steel and iron. It suits perfectly to a warrior with all-rounder stats like Tyrannorot.

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It is derived from Stahlsaurer Tyrannosaurus' tail.