When the Sacred Sky Watch is motivated, its production is not only doubled but it also produces one forge point. The production is also boosted by enthusiastic population and by boosts of certain great buildings. The building's coin production can be plundered if it isn't motivated.
This building requires a road connection.
It is a result of InnoGames' attempt to make rewards from Guild Expeditions unique, thus replacing Shrine of Knowledge as a GE reward. Its properties are almost the same as the SoK giving the same amount of population and coins per square. However, its Forge Point production effectiveness is 50% less.
The Sacred Sky Watch can be obtained from the Rare Jade Relic during the Guild Expeditions. It can also be obtained as a reward for completing the last encounter of level III and IV of the Guild Expeditions.