Unbreakable Vow

You and another willing creature enter into a magically binding agreement, sworn under the witness of a specified third party. This third party may also be designated as a Holder of the Vow. The terms of this vow must be clearly stated and mutually agreed upon by the participants. The spell binds both creatures to the vow, compelling them to uphold it, with severe consequences for failure.

The caster may designate one additional Holder at a time by casting this spell with a spell slot of 6th level or higher. Each Holder must be physically present during casting and verbally identified by the caster. If there are multiple Holders, they must agree either to exercise democratic or independent rights to lift the vow or its punishments.

Effects of the Vow:

1. Compelled Honor: Any participant who knowingly and willingly breaks a term of the vow suffers immediate consequences, enforced by the Holder(s) of the Vow:
- The creature takes psychic damage equal to its maximum hit points minus 1, bypassing all resistances and immunities.
- The creature is unable to cast spells above 1st level, regardless of means.
- The creature cannot wear armor, and any attempts to do so are ineffective.
- To receive the benefits of a long rest, the creature must rest for 12 hours, and it gains no benefits from short rests.

2. Lifting the Punishment: The punishment can only be lifted under one of the following circumstances:
- Forgiveness granted by the Holder(s) or the original caster.
- A Wish spell specifically used to undo the punishment.
- Divine Intervention by a deity.
- Retroactive Fulfillment of the vow’s terms, to the satisfaction of the Holder(s).

When the punishment is lifted, the affected creature is restored to full health, regains all expended spell slots, and gains the effects of a *haste* spell for 1 round, without suffering lethargy when the effect ends.

Completion Reward: If the vow requires a specific task to be completed, the Holder(s) of the Vow may, at their discretion, grant a reward to the participants upon successful fulfillment of the vow’s terms. This reward must be agreed upon during the casting of the spell, and may include one of the following:

- Blessing of Resilience: For the next 24 hours, the participants gain resistance to all damage types except psychic and are immune to the frightened condition.

- Favor of the Arcane: All spell slots are restored, and for 1 hour, each participant gains a +2 bonus to spell attack rolls and spell save DCs.

- Gift of Vitality: Each participant’s maximum hit points increase by 10, and they regain hit points equal to half their total hit points.

- Emblem of Fealty: Each participant receives a magical emblem or mark visible only to others bound by the spell. This emblem grants an advantage on all Charisma (Persuasion) checks made with creatures familiar with the vow’s completion and increases passive Perception by 2 for the next 24 hours.

The reward fades when its duration ends, signifying the honor of the vow's completion.