Legend Killer

7th-level divination (dragon)

Casting time: 1 action

Range: 60 feet

Target:

Components: V, S, M (a silver scroll describing the spell's target worth at least 1,000 gp, which the spell consumes)

Duration: Concentration, up to 1 minute

Classes:

Subclasses:

You tap into the life force of a creature that is capable of performing legendary actions. When you cast the spell, the target creature must make a successful Constitution saving throw or lose the ability to take legendary actions for the spell's duration. A creature can't use legendary resistance to automatically succeed on the saving throw against this spell. An affected creature repeats the saving throw at the end of its turn, regaining 1 legendary action on a success. It continues repeating the saving throw until the spell ends or it regains all its legendary actions.