The chain, as published
Explore the Church is a quest name used in published walkthroughs, sitting after the Assembly and beside the chapel and prison. The chapter list that is actually written down is short: escape the prison, progress by platforming, find the key, unlock Revelation of Nexus, explore the Ocean, return to the Vivary.
I am not padding that list with room counts I have not seen. If a landing looks optional, it probably holds a crystal or a map fragment, not a new ability. Abilities are present from the start. The Revelation prompt is the game telling you how to use one.
The second pumphouse repair
The church chain sends you back to the Elymere pumphouse. The published note calls this the easiest place to get stuck, because players assume the first repair finished the building. It did not. Power and the old church door are tied to that repair; the church quest asks for it again when a later door still reads as dead.
Revelation of Nexus is the new prompt in this stretch. It is one of the Revelation teachings, alongside Folding, Amplification, Twin Sight, Unbinding, and the blasphemous glaive. You are not buying it. You are being shown a use you already had.
