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. It can also be noted that the shaft, which resembles an hourglass-design, can also be seen as an X.