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|“||Why do you never learn? Love, dream, hope... Worthless. Mere words. And yet your faith in them refuse to die. But no longer. I shall carve a despair into the human soul that will last until your kind finally dwindles and dies!||„|
Mordegon is the main antagonist of Dragon Quest XI. He's an evil being from ancient times that is bent on getting the World Tree's power and destroying the reincarnation of the Luminary.
Prior to the beginning of the game, Mordegon lead his army to raid and ultimately destroy the kingdom of Zwaardsrust. He then lead an army to raid another kingdom, Dundrsail and tried to find and kill the baby Luminary. Fortunately, he did not succeed at this second task. However, he possessed King Carnelian so that he could label the Luminary the "Darkspawn" and have his knights hunt him down. He was also responsible of corrupting Jasper who became jealous of Hendrik always besting him.
He first appears in person when the hero goes to Yggdrasil, stealing his Luminary powers for himself. He sends the Yggdrasil Tree crashing into Erdrea, resulting in countless deaths. Veronica sacrifices herself to ensure that the others survive.
He then has his minions (led by the Spectral Sentinels, which are themselves led by Jasper) search for survivors so that he can take their souls. He sets up his base of operations at the Fortress Of Fear, presumably build by either him or his minions where the Yggdrasil Tree was.
As a side-effect of Mordegon taking over the world, monsters such as the Gloomnivore are able to take advantage of the situation.
However, the Luminary eventually defeats him. Afterwards, the hero then goes back in time to prevent the destruction of the Yggdrasil Tree. The fiend kills Jasper to ensure he isn’t discovered, but is finally defeated by the hero before he could rob him of his power. However, stopping Mordegon ends up allowing another ancient evil to return.
It is eventually revealed that he is in fact the evil side of the mage Morcant, who betrayed Erdwin in an attempt to claim the Dark One's power for himself. Though he still attempts to prevent Calasmos from being resurrected, he attempts to take over the world.