Tree of Savior is a free to play MMORPG available on Steam. You play as a hero on a journey to search for the goddess in a world of chaos. One of the level bosses you might encounter is the demon lord Helgasercle.
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Helgasercle kicks ass. She uses the soul of a demon rival that annoyed her to put a barrier around the Mage Tower in the game. She’s a world boss in the Royal Territory of the game.