ヴィート

A sentient enchanted scythe who communicates via telepathic speech. Vito is capable of contracting with humans, giving them undeath and immortality. 

He was once part of the treasures collected by Gauterio Bonetti when he was still alive, hence he is a reliable source of information for Arvid regarding the true nature of the Coral Sea King and the mechanism behind the wish-granting. Vito derives great pleasure observing Arvid's actions and never hesitates to throw in snarky comments on occasion.