What is mental prison 5e?

Mental prison is a spell in Dungeons and Dragons 5th edition that allows the caster to create an illusory cell in the mind of a target creature. The target must succeed on a wisdom saving throw or take psychic damage and become trapped in the illusory prison, unable to move or take actions for the duration of the spell.

While trapped, the target believes itself to be in a state of intense fear or pain, and can only perceive the cell and the caster. Additionally, the spell allows the caster to deal extra psychic damage to the trapped creature if they attack it with a spell or weapon attack.

Mental prison is a 6th level spell, available to sorcerers and wizards, and requires concentration for the full duration of one minute. It is a powerful crowd control spell that can neutralize a single enemy in combat, but is less effective against creatures with high wisdom saving throw bonuses.