Destroyer

Destroyer is the #3 Ending of Kingsway. In this Ending, the player saves the world by killing the Sky Eater.

Steps-
 * 1) Activate all 5 Monoliths
 * 2) Go through the Gateway in the center of the Map
 * 3) In the Underworld, extinguish all 3 Eternal Flames
 * 4) Attack and defeat the Demon King
 * 5) Choose to go back to the Overworld
 * 6) Beat the Sky Eater

Another method:

Steps-
 * 1) Learn Astral Decay by choosing Ascended or by a Skill Book.
 * 2) Beat the Sky Eater