Blizzard Boost

Blizzard Boost is a support ability from Kingdom Hearts II. Blizzard Boost raises the effectiveness of the Blizzard spell. Blizzard Boost costs four AP to equip.

Kingdom Hearts II

 * Sora learns Blizzard Boost at Level 31 with the Dream Shield, Level 39 with the Dream Rod, and Level 59 with the Dream Sword
 * Donald learns Blizzard Boost after defeating Demyx at Hollow Bastion.
 * Jack Skellington has Blizzard Boost as a default ability.
 * Equip the Mysterious Abyss Keyblade.

Kingdom Hearts II Final Mix

 * Equip the Shaman's Relic staff to Donald.

Kingdom Hearts Birth by Sleep

 * Meld a Shimmering Crystal with a Blizzard-based Deck Command in Command Meld.