Binding Vow

You may cast this spell immediately after describing the conditions of a deal to your intended target creature. If the target creature is willing to accept these conditions both the caster and the target are bound by the conditions set.

The conditions can be anything the caster imagines, but the spell only works if the target is willing and not under the effect of any spell or enchantment that would hinder its ability to fully realize the terms of the deal or increases the target's opinion of the caster, or if the target cannot understand the language the deal was described in. The spell can be dispelled by a casting of wish. If this happens all creatures involved instantly know they are no longer bound by the deal.

Should any creature involved in the deal break the conditions of the deal, all other creatures involved know the deal has been broken, how it was broken, and which creature broke it. All other creatures involved are also no longer bound by the deal. The creature that broke it is also marked for death and a Kolyarut plane shifts to their location one minute after they broke the deal. The Kolyarut's only goal is to kill the guilty creature, and it always knows it's location even if it and the creature are on different planes. If the Kolyarut is destroyed it reconstitutes itself after 24 hours and returns to hunting the guilty creature. Every creature aside from the guilty one will be able to telepathically speak the Kolyarut once per day for one minute, even if they do not know how to speak any languages the Kolyarut will understand. The Kolyarut will only stop hunting if every creature involved in the deal gives clear confirmation to the Kolyarut that they do not wish for the guilty creature to be punished.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher you can include one more creature as a target in the deal for each slot level above 4th.