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Suffice to say, the villains just don't get along. And Hilla doesn't like Arkarium much either, laughing in his face after the events of Heroes Leave his mind trapped in a snake's body.
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Justified as Damien is trying to replace him. Damien has a similar hatred for Arkarium, and it's mutual.
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There is, however, a few Easter Eggs that contradict this and suggest the two are an item, such as in Star Planet and in Friend Story where they Ship Tease occurs. Hilla specifically speaks negatively of him in cutscenes, and one stage of the Dimension Invasion scenario involves factions belonging to both erupting into outright hostilities, the players caught in the middle of the battle.
MAPELSTORY LUCID SOUL UPDATE
In 2018, Nexon announced the BLACK update which finally added the Black Mage as a boss and a new area that will see the end of the long-running main plot of the game. Later MapleStory expansions note As early as the release of the fifth Adventurer class, the Pirate, with many quests in the Nautilus referring to the Black Mage start to expand upon the game's plot, and reveal that an entity called the Black Mage, his Commanders, as well as an affiliated organization called the Black Wings, are responsible for the activities of some of the major bosses, as well as the chaos happening within the regions where these bosses reside. Interestingly, a few quests actually have some unexpected plot twists in them, but these tend to be ignored since the player is just clicking "Next" and not reading the text. However, some quests are worthwhile and have good rewards, but you won't know this until you look at your 'In Progress' quest log AFTER accepting a quest (which most of the time shows the reward) or reading a quest guide on the internet beforehand. These quests can be fairly boring since most of them are fetch quests requiring you to collect 20 Bear Asses.
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In order to really notice this information, the player has to finish certain quests and then connect the dots while looking through their completed quests log. The various in-game regions found in MapleStory have differing backgrounds and plots.
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