Taiyō Ringu

 Taiyō Ringu (太陽のリング, Sun Ring) is one of the seven legendary rings forged by using a legendary wolf spirit. Its main ability is regeneration, it also allows the user to be able to open sun type boxes. It takes the form of a ring which emitts a yellow flame when ignited using spiritual energy.

Powers
Regeneration: This ring allows the ability of regeneration, which means that the user of this can use the spiritual energy which ignites the yellow flame and then use the yellow flame to heal wounds or just replenish energy after a long fight.

Sun Box Unlocking: This ring allows the user to open sun boxes. This is the only ring which can as its the only sun ring made.

Behind The Scenes
This was based off of Katekyo Hitman Reborn's seven elements.