Deshell (status)

Deshell (デシェル, Desheru?), also known as Mental Break (メンタルブレイク, Mentaru Bureiku?), MRes DOWN, and Magic Defense Down, is a recurring status effect that reduces the target's Magic Defense.

Final Fantasy X
Mental Break lowers the enemy's magic defense.

Final Fantasy Tactics Advance
MRes DOWN is a status.

Final Fantasy Dimensions
Magic Defense Down can be inflicted by Return to Darkness.