Scorpio Worm

Tsurugi's alter ego, Scorpio Worm is the Worm that killed Tsurugi and his sister and then mimicked Tsurugi. However, Tsurugi was able to overpower it and suppress his Worm heart, but he loses this resolve as he discovers he is a Worm in episode 46. It is also revealed that his stingers can force Worms to return to their human forms, as demonstrated upon the Clipeus's. He was defeated by Hyper Kabuto's Maximum Hyper Typhoon. He later died in his human form after talking to Jiiya.