Easy way for players to check if their damage output is good without introducing parsers. Feedback is helpful for newer players.
Have several tiers of guildheists (that award 0 xp) that are basically training grounds with a target dummy. Player has X amount of time to do Y damage and complete it.
It could also be fun to have some of the dummy values to be difficult or impossible to clear with the current gear. It would offer a goal for players to work towards.
