Strength Boost PSM (PSMアタックアップ, PSM Atakku Appu?, lit. "PSM Attack Up") is a technique that appear in Kingdom Hearts Union χ. It allows the user to raise their PSM strength.
In Kingdom Hearts Union χ, Strength Boost PSM is a special attack that targets all enemies. It costs 3 special attack gauges to perform. It raises Player's PSM strength by 1 tier for 1 turn.