Deceleratle is a recurring spell in the Dragon Quest series. It decreases one enemy group's agility when cast, with the exact amount varying between games.
Deceleratle returns after several years as an enemy-exclusive spell. Interestingly, a resistance tag for the spell still exists in the game's code even though enemies can only be affected by it if it is reflected with Bounce.
Deceleratle is learned by armamentalists at level 24. It costs 5 MP to cast, and will reduce an enemy group's agility by 25%, capping at 50%. The spell's base accuracy is 50% before resistance is applied, and will reach 100% accuracy when the caster's Magical might reaches 799.