Eclipse Tower

Eclipse Tower (originally known as Luna Tower) is a tower hidden in the ruins below Belinsk, capital 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 Lunar 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
In ancient times, Eclipse Tower was sealed up following a great cataclysm caused by its functions. The vast majority of the tower remained below ground for centuries. However, knowledge of the ruins became available to the citizens of modern-day Belinsk, who would hold a monthly celebration to pray for the revival of the ruins. The peak of the tower was the only portion above ground, and apparently functioned as a museum; however, the citizens were apparently ignorant of the Tower's true purpose.

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 realized 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 Blados and Chalis, the Tuaparang warriors placed in charge of the operation, 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. Eclipse Tower was shut down, and at a later date the people of Belinsk called it Sol Tower.