Blizzard Boost

Blizzard Boost (ブリザドアップ) is an ability that appears in Kingdom Hearts: Chain of Memories, Kingdom Hearts II, and Kingdom Hearts Birth by Sleep. It increases the damage done by Blizzard-based attacks. In Kingdom Hearts: Chain of Memories, "Blizzard Boost" is activated by the Blue Rhapsody card, costs 20 CP to add to your deck, and lasts for 1 reload, while in Kingdom Hearts II, it requires 4 AP to equip, and in Kingdom Hearts Birth by Sleep, up to three copies of it can be equipped.

Kingdom Hearts: Chain of Memories and Kingdom Hearts Re:Chain of Memories

 * The Blue Rhapsody card has "Blizzard Boost" as its ability.

Kingdom Hearts II

 * Sora learns Blizzard Boost at level 32 with the Dream Rod, 39 with the Dream Sword, and 59 with the Dream Shield.
 * Donald learns Blizzard Boost after defeating Demyx at Hollow Bastion.
 * Jack Skellington has Blizzard Boost as a default ability.
 * The Mysterious Abyss has Blizzard Boost as its Equipment Ability.

Kingdom Hearts II Final Mix

 * Sora learns Blizzard Boost at level 32 with the Dream Rod, 39 with the Dream Sword, and 59 with the Dream Shield.
 * Donald learns Blizzard Boost after defeating Demyx at Hollow Bastion.
 * Jack Skellington has Blizzard Boost as a default ability.
 * The Mysterious Abyss has Blizzard Boost as its Equipment Ability.
 * The Shaman's Relic has Blizzard Boost as its Equipment Ability.

Kingdom Hearts Birth by Sleep
Blizzard Boost can be attached to a or  Command recipe through Command Melding, either randomly or by applying a Shimmering Crystal.