Backstab is an unlockable challenge in Benighted Soul, a mod for The Binding of Isaac.

Description:
• Destination: Lamb
• Character: Benighted Samson
• Starting items:
Bomb x 9
Posture! (Consumable slot)
Steam Sale
Backstabber
Berserk!

Blind Mode.

Permanent Wrath.

Any effect that tries to enter Calm leading to Wrath.

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Bonus on finished:
Benighted Samson starts with a random reverse tarot card.

And after clearing Boss Room, common tarot and reversed tarot appear alternately.

Unlock Benighted Samson.

• Download Benighted Soul from the Steam Workshop.