Pactmaker

Similar to a devil, taking this feat allows you to make deals/oaths/promises with other people, rather than the usual pacts. These oaths require you and the other creature (patron) to be willing, as well as understand the nature of what they are offering. The patron doesn't need to understand the specifics, only that you are offering to borrow a portion of their abilities. Once you have formed a pact with someone in this way, you can maintain the pact until either you use the power from the pact, you do something to break the promise, or the patron wishes to revoke the pact.

You can have a maximum of 3 pacts made like this at any time, but only one per creature. Whenever you make the pact, the power stored differs depending on the patron. It can take the form of a spell, a single use of an ability, or a small perpetual bonus to an ability score (details at the bottom of the page).

Spell

• Pact: When you make a pact with a creature it could result in you borrowing one of their spells, or a spell that is related to them. If it is a spell the patron is capable of casting they must decide what level the spell will be when it is triggered. If they are not capable of casting the promised spell the spell is decided by the DM and is always at it's lowest possible level.
• Effect: This pact must be triggered, and after the effect ends the pact is fulfilled and you regain one of your pact slots. When you use the pact the patron must expend a spell slot of the level promised when they made the pact. If they are unable to expend a spell slot they instead take levels of exhaustion equal to the level of the spell. 

Use Ability

• Pact: When you make a pact with a creature it could result in you borrowing an ability that they possess that has a limited number of uses (ex: action surge, rage, channel divinity ect.). Alternatively, if the creature has a resource pool (such as a paladin's lay on hands or a monk's ki points) you could borrow 1/3 of their maximum for that resource (rounded down, minimum of 1) which you can then spend to activate any abilities they can normally spend the pool on, provided you have enough to cover the cost.
• Effect: This pact must be triggered, and after the effect ends the pact is fulfilled and you regain one of your pact slots. When you use this pact the patron must expend a use of the resource promised when the pact was made, and you gain the benefits of that ability. If the patron has no more uses of that ability, or if the patron's ability pool is lower than the amount promised in the pact, you and the patron take 1 level of exhaustion after the pact dismisses. If you no longer have enough points left in the pool to afford any more abilities, the pact also dismisses.

Ability score

• Pact: When you make a pact with a creature it could result in you gaining a small portion of their natural abilities. The patron's highest ability score is reduced by one after making the pact until the pact dismisses. If there is a tie for highest, the patron gets to choose.
• Effect: This pact does not need to be triggered, and constantly gives you a small benefit, although it has a length, and only lasts for 1d4 days after the pact is made before it dismisses. Whatever ability score the patron reduced when the pact was made, you gain a +1 to all ability checks, saving throws, and attacks made using that ability score for the duration of the pact.