Panacea

The Panacea is an item introduced in Kingdom Hearts 358/2 Days. It cures the user of any negative status effects that they are inflicted with.

Kingdom Hearts Birth By Sleep

 * Panacea: Scrapper (30%/25%), Spiderchest (20%/30%)

Kingdom Hearts 358/2 Days

 * Panacea: Possessor (30%), Soldier (30%)

Kingdom Hearts 3D: Dream Drop Distance

 * Panacea: Komory Bat (2%), Woeflower (2%)

Kingdom Hearts 358/2 Days

 * Panacea: A chest at The Palace during Mission 15; a chest at the Tram Common during Mission 17; and two chests during Mission 20: one Under the Tracks, and one in the Tram Common.

Kingdom Hearts Birth by Sleep

 * Panacea (Terra): Chest at the Fountain Court at the Radiant Garden; chest in the Gizmo Gallery at Disney Town; and a chest at the Skull Rock Entrance in Neverland.
 * Panacea (Ventus): Chest at the Mine Entrance/Mine in Dwarf Woodlands; chest in the Aqueduct at the Radiant Garden; chest in Pete's Rec Room at Disney Town; and a chest along the Sea Coast in Neverland.
 * Panacea (Aqua): Chest at the Front Doors at the Radiant Garden; chest in Pete's Rec Room at Disney Town; and a chest at the Rainbow Falls Base in Neverland.

Kingdom Hearts 3D: Dream Drop Distance

 * Panacea (Sora): Chest at the ; chest at the Solar Sailer; chest at the Rectifier 1F; chest at the Ocean Floor; chest at the Fields.
 * Panacea (Riku): Chest at the ; chest at the Solar Sailer; chest at the Rectifier 1F; chest at the Monstro: Mouth; chest at the Monstro: Cavity; chest at The Opéra.

Etymology
A is a fictional medicine that was supposedly a cure-all that could extend one's lifespan. It, in turn, got its name from the Greek goddess of healing, Panacea.