Instanced Containers

Loot chests and barrels become instanced: each player who opens one receives their own generated contents, and what one player takes does not remove items from the container for other players. Loot saved to the chest stays available to players who open it later, including after the container was explored once. Settings and stored data are kept in JSON files, so the state persists across server restarts.

Because of a limitation in how the mod works, it only applies to chests and barrels, and it runs on the server. Players join without installing anything, and only the server needs the mod.