From Gamer Escape, the free Final Fantasy XI encyclopedia
Melzas is an ancient and powerful demon. Though he was imprisoned long ago by the Guardians of the Seal, he has returned and is terrorizing the villagers of Inoa.
[...] Alundra has a mysterious dream where a strange being named Lars tells him that he is a wizard and one of the guardians of the seal. Suddenly, Alundra sees a vision from the village of Inoa. After that, Lars calls Alundra 'Releaser' and tells him that north of the village there is a dark lake and below it there has lied a demon for over 1000 years and now the demon has awakened once more. After telling this, a creature named Melzas appears and points out that nobody has the power to stop him, especially not a human like Alundra.
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