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

Description:
• Destination: ???
• Character: Benighted ???
• Starting items:
Brother Bobby
Memory x 99

Blind Mode.

Starts with a permanent orb of Falsehood of Apollyon.

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Bonus on finished:
Benighted ??? starts with Falsehood of ???.

Unlock Benighted ???.

• Download Benighted Soul from the Steam Workshop.