Yes, the untapped power that lies within you. Now, child, it's time you awakened that power and realized your full potential.
Prime - Maleficent 6★ Medal
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The Missing Ache (ミッシングエイク Misshingu Eiku?) is a form of Roxas's Kingdom Key which appears in Kingdom Hearts 358/2 Days. It can be upgraded to the Missing Ache+.

Stats

Kingdom Hearts 358/2 Days
Missing Ache
Stats
Strength Magic
Base Unit Ultima Base Unit
+0 +0 +0 +0 +0
Defense Crit Rate Crit Bonus
Base Unit Base Unit Base Unit
+0 +0 +3 +0 +0 +0
Attack Speed Approach Speed
Ground Air
1.0 1.0 1.0
Obtained
Attach Skill Gear
Kingdom Hearts 358/2 Days
Missing Ache+
Stats
Strength Magic
Base Unit Ultima Base Unit
+0 +0 +0 +0 +0
Defense Crit Rate Crit Bonus
Base Unit Base Unit Base Unit
+0 +0 +4 +0 +0 +0
Attack Speed Approach Speed
Ground Air
1.0 1.0 1.0
Obtained
Attach Skill Gear +2