Ability:

Give a power, object or change an event through an agreement

Limitations:

- Users may require a significant amount of power to make a deal
- The payment for the contract may be the user's power source, such as souls
- Destroying the contract may nullify it
- The user must follow the any unbreakable rules of the contract
- May have loopholes in the agreement
- Payment may be delayed until a later point as agreed upon in the contract
- The contract can be overruled by a higher power, such as a deity
- Payment can be transferred to a third party if the said party agrees
- There may be more conditions to the deal than expected or desired
- Breaking a contract may come at a cost
- May be everlastingly binding, cannot be broken

Users:

- Hades (Disney's Hercules)
- Ursula (The Little Mermaid)
- Dr. Facilier (The Princess and the Frog)
- Rumplestiltskin (Once Upon a Time)