Dark Deal

By offering a fragment of your own soul, you strike a pact with the dark forces of the Abyss, channeling the might of a demon lord into your mortal form. Your physical appearance warps to reflect the chosen demon lord’s influence, and your powers surge with demonic energy. Choose one of the following demon lords, or roll randomly to determine which powers you gain:

1. Demogorgon: Gain two additional melee attacks per turn, tentacle attacks that deal 4d12 poison damage, and the ability to drive creatures insane with your gaze (DC 22 Wisdom save).
2. Orcus: Gain the Finger of Death spell (DC 22), the ability to summon undead as a legendary action, and immunity to necrotic damage.
3. Graz’zt: Gain Dominate Monster at will (DC 22), immunity to charm effects, and advantage on Charisma checks and saves.
4. Baphomet: Gain a gore attack dealing 6d12 piercing damage, advantage on melee attacks, and truesight up to 120 feet.

Regardless of the demon lord chosen, you receive the following benefits:

• Increased Strength and Constitution: Your Strength and Constitution scores each increase to 26.
• Demonic Resilience: Gain resistance to all nonmagical damage and immunity to poison and fear.
• Legendary Resistance: You can succeed on up to three saving throws of your choice during the spell’s duration.

Heavy Cost:

Upon casting Dark Deal, you sacrifice more than your mortal essence, risking both your soul and sanity. The price you pay includes the following effects:

1. Permanent Soul Damage: Your maximum hit points are permanently reduced by 25%. Only a Wish spell or divine intervention can undo this reduction, as the fragment of your soul used in the soul stone is lost forever.
2. Demonic Corruption: Each time you cast Dark Deal, make a Charisma saving throw (DC 20). On a failure, your soul is stained by the demon lord’s essence, permanently altering your alignment one step closer to Chaotic Evil. Each failure also brings you closer to a permanent transformation. After three failed saves, the corruption becomes irreversible, and the following effects occur:

• You become a fiend of the Abyss, taking on a demonic form influenced by the chosen demon lord’s powers.
• You lose all mortal memories, desires, and alignment traits, fully transforming into a chaotic evil creature subservient to the Abyss.
• This transformation is permanent and cannot be reversed by any known magic, effectively ending your life as a mortal and marking your new existence as a demon.

1. Psychic Backlash: When the spell ends, you suffer 10d12 psychic damage as the demonic essence departs violently. This damage ignores resistances and immunities. If you are reduced to 0 hit points, you must make three death saving throws as your soul is torn between mortal life and the Abyss, potentially dragging you to the demon lord’s plane of origin.
2. Pact-Bound Soul (Optional): If a particular demon lord was invoked, your soul becomes bound to their service upon death. Resurrection or revival requires a Wish spell, and there is a 50% chance that each attempt will fail as the demon lord refuses to release your soul. Should your soul remain bound, you are drawn into the Abyss, where you are eternally under the demon lord’s control, either as a thrall or a lesser demon.

Special Note on the Cost of Demonic Transformation:

Each casting of Dark Deal brings you closer to the influence of the Abyss, risking both your mortal soul and mind. As you inch toward full corruption, you begin to lose touch with your humanity, showing signs of demonic possession, cruelty, or unstable impulses. The choice to invoke this spell carries a nearly irreversible path to darkness.