Eclipse Tower

Eclipse Tower (originally known as the Luna Tower) is a tower hidden in the ruins below Belinsk, capitol of Morgal.

Description
The Eclipse Tower is powered by the Alchemy Dynamo located below Belinsk. In their quest to gain power beyond control over the four elements, the Jenei built Luna Tower to harvest power from the sun. The device's actual function is to not only block out the sun via a Luna eclipse, but to actually absorb its light. A side effect of this is that anything draped in the shadow it casts is void from the normal energies (light and heat) that repel monsters of darkness, making them not only spawn frequently, but also more powerful than they would otherwise be.

Story
Three groups sought the activation of Eclipse Tower. Volechek was tricked into believing it was a weapon that he could use to protect his country from Bilibin and Sana, and thus sought to activate it (though immediately tried to reverse it when he realised Belinsk too would be harmed by its activation). The Tuaparang sought its activation, with their objective being to use it as motivation for Matthew's group to power up the Apollo Lens, but also valued it for its own sake (as they attempted to stop Matthew's group from ending the Grave Eclipse). The final party was Alex, who worked with the Tuaparang, though his true motives were unclear, as he eventually rebelled against his former comrades and ended up helping to stop the Grave Eclipse.

These groups worked to hold Eoleo and Hou Ju hostage in Belinsk Castle. The consequence of this was forcing Matthew and Ryu Kou's group(s) to attempt to sneak into the castle via Belinsk Ruins. To do this required the use of the Magma Orb, which, unbeknownst to them, was the start-up device for the Alchemy Dynamo. After being forced to head into the depths of the ruins, Ryu Kou, despite the pleas of everyone else present to do otherwise, activated the Dynamo, and activated Eclipse Tower, triggering the Grave Eclipse.

To rectify this, Matthew's party activated the Apollo Lens, which blasted Eclipse Tower with concentrated light and ended the Grave Eclipse (it is unclear if this destroyed the tower, or simply caused it to shut down).