Experience Boost

Experience Boost (EXPチャンス), also translated as EXP Chance and EXP Boost, is an ability introduced in Kingdom Hearts II. It doubles the experience the user earns for defeating enemies when HP is below 50% in Kingdom Hearts II, or 25% in Birth by Sleep and Dream Drop Distance.

Mechanics
In Kingdom Hearts II, Experience Boost is a that costs 3  to equip, 4 AP in Kingdom Hearts II Final Mix.

In Kingdom Hearts Birth by Sleep, EXP Chance is a that can be equipped once.

In Kingdom Hearts 3D: Dream Drop Distance, EXP Boost is a that can be equipped once.

Strategy
In Kingdom Hearts II Final Mix, in critical mode, enemies are typically too strong to make any use of this ability early on in the game. Later on, when the player reaches The World That Never Was, the player will have reached a high enough level endure at least one attack and retain less than half of their total HP without dying. It is also a good idea to synthesize defense boosts to increase Sora's defense to allow him to endure attacks without dying. If Sora's HP is too low for the player's comfort, make use of a safe point by staying in it long enough so Sora's HP is just under half of his total HP. Although this method is tricky, it can triple Sora's EXP gain by equipping the support ability and the Gull Wing at the same time. However, as the player increases in level, this method becomes increasingly easier due to Sora's defense and attack stats increasing as he levels up. It is also highly advised to level grind using nobodies as nobodies always drop magic orbs while heartless drop health orbs, which will heal Sora eventually negating Experience Boost's benefits.

Kingdom Hearts II

 * Sora learns Experience Boost at levels 7 with the Dream Rod, 9 with the Dream Sword, and 17 with the Dream Shield.
 * The Gull Wing has Experience Boost as its Equipment Ability.

Kingdom Hearts Birth by Sleep

 * EXP Chance can be attached to a or  Command recipe through Command Melding, either randomly or by applying a Abounding Crystal.

Kingdom Hearts 3D: Dream Drop Distance

 * Sora and Riku can purchase EXP Boost from the Cera Terror Ability Link for 300 Link Points.
 * Sora and Riku can purchase EXP Boost from the Drill Sye Ability Link for 300 Link Points.
 * Sora and Riku can purchase EXP Boost from the Keeba Tiger Ability Link for 300 Link Points.