Instances
QUEST INSTANCES
Sometimes quests will send you on a private adventure (an "instance") for you to complete. These instances can only be entered while you are on the quest. In general, none of these instances can be repeated. However, even if you have already completed an instance quest, you can still help members of your fellowship complete the quest themselves by visiting a Reflecting Pool. The Reflecting Pool will enable you to join your fellowship inside the instance.
World instances
A World instance is designed for a full fellowship that needs to work together to overcome difficult challenges. These instances contain boss encounters that drop rare or better quality loot.
See World instances for more detail.
Public dungeons
See Public dungeons for more detail.
Raids
See Raids for more detail.
Session Play
See Session Play for more detail.