It's a quest for strong clans, which usually fight and take beacons. Reward - 1000 sydian for all clan, but not each player. Sydian is placed in the inner location of the island and you need a compass to take it. If someone from your clan took the compass and went offline, you can kick him from the clan and compass will return to the chest.

When you get the quest, a special compass appears in your clan-chest, which automatically (only once) selects a random island with time from 1 to 2 days. You must team up and try to fight and take the selected beacon. Compass must be in the backpack of captain of the frigate.

When you get to Opportunist's Pier - click on the Compass ant it will show with arrows, in which direction you must sail. When you reach the island - Heaven's voice will let you know.
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Some maths.

Beacon gives +450 sydian per 3 hours. 1000 sydian is equal to 6+ hours.

Usually when you fight a beacon, you randomly get an island with time from 1 to 48 hours = average 24.5 hours. When you take a beacon with compass, time will be from 24 to 48 = average 36 hours.

But quest has initial expire time - 24 hours.
After 12 hours of the quest, the initial average time of island (36h) will become to 24 hours, which is equal to usual random island timeout. But quest still gives 1000 sydian. Which could be collected from the usual island in 6 hours.

This means, that it's no reason to take a beacon with compass, if quest has 6-7 hours left.

Thank you