You magically replace your heart with one forged on the second layer of the Abyss.
Casting this spell magically transports your mortal heart to the lair of one of the lords of Hell. The heart returns to your body when the spell ends. If you die while under the effects of this spell, you can’t be brought back to life until your original heart is retrieved.
Your chest pulses with hellish power as a demonic heart replaces yours. Immune to fear and poison, fire and blades glance off you. Magical resilience courses through, granting advantage against sorcery. A menacing aura terrifies those nearby, binding them in dread.