Tonbokiri

One of the Three Great Spears, a spear made by Fujiwara Masazane of Muramasa school. On the blade's inside part, there are beautiful Sanskrit characters and trident drawn. His name comes from an anecdote where a dragonfly that landed on top of the blade was instantly cut in two. Although he's big, he has simple and sincere personality.

(Source: Touken Ranbu Wikia)