Bind Byakhee

5th-level enchantment (formula)

Casting Time: 1 minute (5 phases of 2 rounds when cast as a formula)

Range: 60 feet

Components: V, T (when Carcosa’s star system is above the horizon, such as mid-Spring to mid-Fall on Earth’s northern hemisphere), M (a magic whistle, or a whistle that has a spell on it throughout the casting time)

Formula Ability Checks: Intelligence (Arcana) or Wisdom (Yog-Sothothery) DC 16, Charisma with a wind instrument DC 16, Charisma with a wind instrument DC 16

Formula Backlash: 5d4 psychic damage

Formula Failure: Magically frightened for 1 hour and one level of exhaustion

Duration: Until task is complete, up to 10 days

You compel a single byakhee you can see and that can hear your music within range to carry out a task you choose. Traditionally this spell utilizes a whistle but any wind instrument will do Any byakhee within range that was conjured by the lure byakhee spell calmly listens to the tune you play or sing as part of casting this spell until you make an error (either by not finishing the spellcasting or by failing an ability check when casting the spell as a formula), at which point all byakhee present are free to attack you or do as they wish, although they can still be affected if you successfully complete the spell. When you finish casting the spell, the target can negate your binding by succeeding at a Charisma saving throw.

At Higher Levels. When you cast this spell using a spell slot of 7th or 8th level, you can bind two byakhee. When you cast it using a 9th-level spell slot, you can bind three.