Cynthia's Duelist's Dome

Illusory shards of glass swirl around the caster as a 10-foot Emanation for the duration of the spell.

When you cast this spell, you can designate creatures to be unaffected by it. Any other creature who enters the dome perceives the glass. At the start of the creature's turn, they must make an Intelligence saving throw. On a failed save, the creature is unable to move away from the caster, on successive turns, the creature may make an Intelligence saving throw at the end of their turn to end this effect. On a successful save, they may attempt to the leave the Emanation. 

If a creature willingly leaves the Emanation, they must make a Dexterity saving throw. On a failed save, the creature takes 5d8 psychic damage. On a successful save, the creature takes half as much damage.

When you cast this spell using higher level spell slots, the Emanation radius increases by an additional five ft. per spell slot level expended. 

Any creatures with true sight are immune to this effect.