The Contract With Hell is an artifact with a long and dark history. The existence of this agreement has been debated for centuries, and only by word of mouth since all written proof was mysteriously disappearing. It is said that once the person signs the contract with his blood, he is granted access to powerful dark magic.
Rumor has it that only those genuinely evil can sign the agreement, so it's not accessible to anyone. Since everything has its price, the most courageous eventually have to pay their debts. Although agreement can give you power, it can also take it away with a little extra: once the deal ends, the person is damned for eternity in hell!
To this day, nobody knows if it's worth the eternal suffering, but some still desire it and actively ask for the devil's whereabouts.