You shoot a ray of necromantic energy from your outstretched hand, causing one creature of your choice within range to violently purge blood vessels through its skin. Constructs and undead are not affected by this spell. The target must make a Constitution saving throw, taking 8d10 necrotic damage on a failed save, or half as much damage on a successful one.
On a failed save, the target's purged blood vessels are magically animated, creating a many-layered mass of magically strong, adhesive tissue that trap those caught in them. The avascular mass instantaneously erupts into a 20-foot radius sphere centered on the target. The avascular mass is difficult terrain and lightly obscures their area.
If the avascular mass isn't anchored between two solid masses (such as walls or trees) or layered across a floor, wall, or ceiling, it collapses on itself, and the spell ends at the start of your next turn.
Each creature that starts its turn in the avascular mass or that enters them during its turn must make a Dexterity saving throw. The original target of the spell automatically fails this saving throw. On a failed save, a creature is restrained as long as it remains in the avascular mass or until it breaks free.
A creature restrained by the avascular mass can use its action to make a Strength check against your spell save DC. If it succeeds, it is no longer restrained.
Any 5-foot cube of avascular mass that takes more than 10 radiant damage on a single turn disintegrates. When the spell ends, the blood vessel mass becomes a small layer of limp, decaying tissue.
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