Set
The set npc update origin packet is used to set the relative coordinate for npc info packet. As of revision 222, with the introduction of world entities, it is no longer viable to solely rely on the local player's coordinate, as it may be impacted by a specific world entity. As such, npc info updates should now be prefaced with the origin update to mark the relative coord. For no-world-entity use cases, just pass the player's coordinate in the current build area to get the old behavior.