Bind Star Vampire

7th-level enchantment (formula)

Casting Time: 1 hour (5 phases of 12 minutes when cast as a formula)

Range: 60 feet

Components: V, S, M (a text copy of this spell), SC (0 to 6, who must recite from text; +1 bonus to formula ability checks per 3)

Formula Ability Checks: Intelligence (Arcana) or Wisdom (Yog-Sothothery) DC 21, Intelligence (History) or Wisdom (Yog-Sothothery) DC 21, Intelligence (Arcana) or Wisdom (Yog-Sothothery) DC 21

Formula Backlash: One level of exhaustion and 7 psychic damage

Formula Failure: Magically frightened for 8 hours and another level of exhaustion

Duration: Until task is complete, up to 10 days

When you begin casting this spell, you force a star vampire you can see within range to remain within range and refrain from attacking you and any secondary casters (except while the casting time is paused). When you finish casting the spell, if the target remains within range and it can hear and understand you, you compel it to carry out a single task you define unless it succeeds on a Charisma saving throw.