Experience Boost

Experience Boost is an ability found in Kingdom Hearts II and in Kingdom Hearts Birth by Sleep. It allows the player to gain a 100% experience boost when the HP bar is below half. In Birth by Sleep, you can get the ability by using a Abounding crystal when melding commands.

Obtained
Kingdom Hearts II
 * Sora gains this at level 9 (Dream Sword), level 7 (Dream Rod), and level 17 (Dream Shield).
 * The Gullwing Keyblade comes with Experience Boost as a passive ability.