Dream Dome

You are able to create a dome in the shape of a translucent, pearlescent sphere of energy; within this area no creature is able to lie, and whenever a creature speaks, it speaks only the truth. For the duration, no outside attack can enter the dome, and no spell other than a healing spell can be cast within it. A creature that enters the dome is subject to all its effects.

Creatures within this dome regain 2d4 hit points every minute and can’t make attacks or do anything that deals damage to another creature (including themselves). To leave this sphere, a creature must make a Charisma saving throw, passing through it normally on a success. On a failure, the creature can’t leave and has disadvantage on its next attempt.

At Higher Levels. When you cast this spell by spending Mana points equal to a 4th-level spell or higher, the healing increases by 1d4 and the radius increases by 10 feet for each spell level above 4th.