Instance
Instances allow players to fight certain bosses alone or with other players in private rooms. In an instance, other players cannot join unless they know the name of the instance created by the original player. To start or join one, players can right-click on the entrance to a boss' chamber and select "Join instance", and type in the name of the instance they wish to join or create. Any items on the ground will disappear and the instance will be deleted if there are no more players in it after two minutes. However, certain bosses like Nex will have their loot remain in the instance for players to re-obtain if they rejoin.
For certain bosses, players can also choose to "Join instance (hm)", allowing them to fight the hardmode version of said boss.
Instance Bosses
The following bosses can be fought as an instance:
