Decelerate is a recurring spell in the Dragon Quest Series. It decreases one enemy's agility by one level with 50% accuracy.
Decelerate is learned by armamentalists at level 10. It costs 3 mp to cast, and will increase in accuracy once the caster's magical might reaches 50. When the value reaches 499, the spell becomes 100% accurate barring monster resistance. The affects of the spell last for 7~10 turns.