Onimaru

The Onimaru (おにまる) is a weapon in  and is Crono's fifteenth-level katana. It has an attack power of 150.

Info
It can be found at the Northern Ruins in a sealed chest in the Middle Ages. If the chest is opened in the Present, the item has upgraded into the Suzaku. After the Suzaku has been acquired, it can still travel back in time and collect the Onimaru.

Etymology
Historically, Onimaru is the name of a famous Japanese katana. Regarded as a great treasure, it is also one of the "Five Swords under Heaven". Onimaru literally translates to "Devil Circle".