You loop a thought process in the target's mind, forcing it to repeat a moment's worth of actions. The target must attempt a Will save. If the target fails, whatever actions the target uses on its next turn, it must repeat on its following turn. The actions must be repeated in the same order and as close to the same specifics as possible. For example, if the target makes an attack, it must repeat the attack against the same creature, if possible, and if the target moves, it must move the same distance and direction, if possible, on its next turn.
If the target can't repeat an action, such as Casting a Spell that has been exhausted or needing to target a creature that has died, it can act as it chooses for that action but becomes Stupefied 1 until the end of its turn.
Traits
An action with this trait requires a degree of mental concentration and discipline.
An ability with this trait can take a character completely out of the fight or even kill them, and it's harder to use on a more powerful character. If a spell has the incapacitation trait, any creature of more than twice the spell's rank treats the result of their check to prevent being incapacitated by the spell as one degree of success better, or the result of any check the spellcaster made to incapacitate them as one degree of success worse. If any other effect has the incapacitation trait, a creature of higher level than the item, creature, or hazard generating the effect gains the same benefits.
You must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can't perform actions with this trait. Manipulate actions often trigger reactions.
A mental effect can alter the target's mind. It has no effect on an object or a mindless creature.