Survey

The The fallback content to display on prerendering must fully explore the battle map by gaining all required The fallback content to display on prerendering. The default number of required skyshards is 3, although the encounter may specify a different amount. The encounter is failed if the party does not gain all of the required skyshards. This is the most common objective for delve battles found in guild quests.

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How does Uncover differ from Survey?

Aspect	Uncover	Survey
XP Rewards	1 XP for each collected skyshard and encounter reward (if successful). You still gain XP for skyshards if you retreat with at least 1 party member still alive.	Encounter Reward XP only
Partial Completion	You gain XP for each skyshard even if retreating before completing the encounter.	Not possible, encounter is failed.
Encounter Duration	End of battle round, however it is optional even after objective is met.	End of battle round, not optional.