You create a wall of negative energy on a solid surface within range. You can make the wall up to 60 feet long, 20 feet high, and 1 foot thick, or a ringed wall up to 20 feet in diameter, 20 feet high, and 1 foot thick. The wall is opaque and lasts for the duration.
When the wall appears, each non-undead creature within its area must make a Constitution saving throw. On a failed save, a creature takes 4d8 necrotic damage and has its speed halved until the end of their next turn. On a successful save, it takes half as much damage and does not have its speed halved.
A non-undead creature takes the same damage when it enters the wall for the first time on a turn or ends its turn there. The other side of the wall deals no damage. An undead that passes through either side of the wall has its speed doubled until the start of the undead's next turn.
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