Silts Tower is a tower with an upper door in Vale Sangora. On the master world page it is listed as the entry point of a hidden-ending dream route. This page contains full spoilers.
What it is
A tower that does not function as a quest hub — its significance is entirely in the upper door.
Why it matters
Hidden ending route
Open the upper door to enter the Home Sweet Home dream route — the sequence that leads to the Together Forever hidden ending. This is a deliberate alternative to the standard finale: you choose to enter the dream route from the tower rather than finish the main story.
As with the other hidden-ending routes, this is not a required beat — it is the exit for a specific ending goal, so it only enters your plan once you know which ending you are chasing. The 30-day timer still governs everything you do before reaching it.