Two Become One

The Two Across Keyblade is obtained after defeating Roxas in Kingdom Hearts II: Final Mix . This Keyblade, along with the Winner's Proof Keyblade are Final Mix+ exclusives. Its Keychain motif is Roxas' zipper symbol, which is based on the 'spike' motif found in every Organization XIII member's weapon.

An interesting sidenote about this weapon is that when equipped, going into any Drive form (with the exception of Final Form) will cause Sora to go into Anti Form most of the time.

Stats

Kingdom Hearts II
Two Become One Two Become One Two Become One Two Become One
Ability
Anti Form/Final Form Drive