Bond of Flame

The Bond of Flame is a Keyblade given to Sora by Axel after he sacrifices himself to save Sora from the Nobodies in Betwixt and Between in Kingdom Hearts II. It enhances fire-elemental attacks.

Appearance
This keychain, teeth and blade resembles Axel's chakrams. When you attack with it, it shows Axel's weapon.

'Bold text'' Also as the name suggests it may represent Roxas and Axel's friendship