You shoot a ray of necromantic energy from your outstretched hand, causing any living creature struck by the ray to violently purge blood vessels through its skin. You must succeed on a ranged spell attack to hit the subject. If the spell attack is successful, the target loses half its hit points (rounded down) and is stunned for 1 round. On a successful Constitution saving throw, the subject is not stunned.
The purged blood vessels are magically animate, creating a many-layered mass of magically strong, adhesive tissue that trap those caught in them. The avascular mass instantaneously erupts from the target, and must be anchored on last least two opposed points— such as floor and ceiling or opposite walls—or else the mass collapses and has no effect. Creatures caught within a 20-foot-radius avascular mass become restrained. The original target of the spell is automatically restrained.
Because the avascular mass is magically animate, and gradually tightens on those it holds, if someone casts a concentration spell, they must make DC 20 Concentration saving throw for each turn that they are in the avascular mass.
Anyone within 20 feet of the primary target when the spell is cast must make a Dexterity saving throw. If this save succeeds, the creature is not stuck in the avascular mass and is free to act, though moving may be a problem (see below). If the save fails, the creature is stuck. A stuck creature can break loose by spending 1 round and succeeding on a DC 20 Strength check or a DC 25 Acrobatics check. Once loose (either from making the initial Dexterity save or a later Strength check or Acrobatics check), a creature may progress through the writhing blood vessels very slowly. Each round devoted to moving allows the creature to make a new Strength check or Acrobatics check. The creature moves 5 feet for each full 5 points by which the check result exceeds 10.
If you have at least 5 feet of avascular mass between you and an opponent, it provides half cover. If you have at least 20 feet of avascular mass between you, it provides full cover.
After one minute, the blood vessel mass becomes only so much limp, decaying tissue.
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