Remnant 2, much like its predecessor (and perhaps even moreso!) is a game all about the little discoveries. Like many Souls-likes, Remnant 2 doesn't explain a lot of its mechanics, or how its various sytems interact with eachother.
Indeed, the prodecurally generated nature of its level design mean that every player's starting world is going to be different, and the levels themsleves can contain different items/be made of different sections depending on the seed that generated them.
Because of that, Remnant 2 has a chunk of hidden content by design. Even going as far as hiding entire classes behind story choices, or only revealing them after certain requirements have been met. But now way is this more evident than the Archon, one of the game's many hidden classes.