Region Discovery

A player who steps into a new region sees a title announcement the first time it happens. Ruined cities deep underground announce themselves when entered, a biome never visited earns its own message, and a Nether portal crossed for the first time counts as a discovery too. Repeat announcements can be switched on for regions the player re-enters. Each discovery is saved for the individual player, tied to their UUID, so it persists through restarts and does not depend on any client.

The mod runs entirely on the server. Notifications use ordinary vanilla title packets with no custom networking, so a player on a vanilla client needs nothing installed, and single-player and dedicated servers both work. Detection tests only the candidate structures in the current chunk, which keeps the load small even on a pack with many structure mods. The same jar can serve both client and server packs, and Fabric API is required to run it.