Soul Donation Machine is an unlockable machine in The Serpent, a mod for The Binding of Isaac.

Costs half a soul or black heart to play.

Starting from Chapter 4, costs a full soul or black heart to play.

Soul Donation Machines have a 12.5% chance to replace Blood Donation Machines.

Possible payouts
• 2 or 4 coins of any type.
• 1 or 2 keys.
• 1 or 2 bombs.
• Rarely drops an eternal heart.
• Explodes, giving one of the final payouts.

Final payout
One of the following:
• Rosary
• Converter

When destroyed
• 2 coins, 1 key, 1 bomb or any combination of these.

Defeat Mega Satan as Tainted Serpent.

• Download The Serpent from the Steam Workshop.