Pain Barrier

A passable barrier of shadow energy rises from the ground at a point of your choice within range of the spell. It is 20 feet long, 5 feet high, and 1 foot thick. Each creature that crosses this barrier must make a Constitution saving throw. On a failure, the creature has its speed halved, gains vulnerability to necrotic damage, and has disadvantage on saving throws against spells from the Mystery of Necromancy for 1 minute. On a success, only its speed is reduced.

A creature affected by this spell must make a Constitution saving throw at the end of each of its own turns, ending the spell’s effect early on a success.

At Higher Levels. When you cast this spell by spending Mana points equal to a 5th-level spell or higher, the barrier increases by 10 feet in length for each spell level above 4th.