Honoo no Tsuki

One of the 21 Ō Wazamono swords

The sword Garp gets for Roja and its flame like patterns and color makes Roja think of Ryujin Jakka, which is his first soul power.

Couldn't handle the growing power and heat of Roja's abilities and was deforming and breaking, Roja threw it in the ocean when he obtained Hiru.