The Hollowed Knight is a formidable replayable boss connected with the events surrounding Vance.
Encounter
The full-strength Hollowed Knight offers a more demanding challenge than its weakened story appearance. It is designed as a repeatable boss encounter.
Story
Story spoilers
The Knight's origin is connected to Gideon's missing friend and the Stranger's influence. The related story encounter is covered in Vance (Quest).
Replayability
Unlike the weakened story fight, the full challenge can be replayed.