Dark Swamp of the Underworld

You transform the ground in a 40-foot-radius, 20-foot-deep cylinder centered on a point you can see within range into a churning swamp of adhesive mud.

The area becomes Difficult Terrain.

When the swamp appears, each creature on the ground in the area must make a Dexterity saving throw.

• On a failed save, a creature sinks partially into the mud and is Restrained.
• On a successful save, a creature moves to the nearest unoccupied space outside the swamp using its reaction.

A Restrained creature can use an action to make a Strength (Athletics) check against your spell save DC, ending the Restrained condition on a success.

When a creature enters the swamp for the first time on a turn or starts its turn there, it sinks deeper into the mire:

• If the creature is not Restrained, it must succeed on a Strength saving throw or become Restrained.
• A Restrained creature sinks 5 feet deeper.

A creature submerged at least 10 feet into the swamp has Total Cover against creatures outside the swamp.

A creature completely submerged in the swamp begins suffocating unless it can breathe without air.

The caster can move across the swamp’s surface without penalty and cannot be Restrained by it.

When the spell ends, the swamp vanishes and creatures within it are gently deposited on the nearest unoccupied ground.