Riddle (5e spell)
From D&D Wiki
|Casting time:||1 action|
|Range:||Self (40-foot radius)|
|Duration:||Concentration, up to 1 minute|
You call upon an extraplanar entity, an alien intellect or devious fiend, becoming a conduit for its power as you speak out a complex riddle. Creatures that cannot hear you or do not have a spoken language are unaffected; however a creature understands the riddle even if it cannot understand your language, so long as it has at least one spoken language. Until a creature answers the riddle correctly by succeeding on an Intelligence save, it is subject to the crushing otherworldly presence of the being whose power you have called upon. On a successful save, a creature takes 2d6 psychic damage from the brush of the vast otherworldly intellect. On a failed save, the creature becomes stunned for the duration. At the start of each of the creature’s turns before the spell ends, the creature takes 4d10 psychic damage, and can make another saving throw. On a successful save, the spell ends.