Ena Module is a machine in Road to Enlightenment, a mod for The Binding of Isaac.
If E.N.A is held, an E.N.A Module spawns in the starting room of every floor in the top-left corner.
When touched, a menu pops up that displays the currently selected E.N.A alongside its corresponding passive ability and level upgrades.
The selected E.N.A can be changed by scrolling to a new one with the up and down attack buttons. Left and right attack buttons look through the level upgrades of the current E.N.A.