Odd Key is an unlockable trinket in Benighted Soul, a mod for The Binding of Isaac.

• Boss Rush keeps open.

When Boss Rush is finished, spawn Pandora's Box, and then removes this trinket.

With Mom's Box, spawns 1 extra Pandora's Box.

The golden version spawns 1 extra Pandora's Box.

Only one Odd Key is valid for a time.

Complete Boss Rush on Hard Mode as Benighted Lost.

The following special synergies and interactions for Odd Key have been documented.

* Note that not all possible synergies and interactions are listed here.

• Download Benighted Soul from the Steam Workshop.