Will

Will is one of the Commanders of the Black Mage and is called the Spider King, and is also the main antagonist of Zero's story.

Story:
During at meeting with the other Commanders, Will tells of a world called Mirror World, in which he says, "It's not a dream, it's the truth."

Mirror World is a place where Will used a bit of Rhinne's power to trap Rhinne, but Rhinne then shed a tear and created her successor so Will split her child into two, a boy (Alpha) and a girl (Beta) and sealed away one and kept the other one for their own use. Will is the main antagonist of Zero's storyline as Will created the Shadow Knights and tried to take all of Rhinne's Goddess Teardrops and get back Nine (Alpha) to the Shadow Knights. But as Nine won't come back, Will gets more annoyed and at the end when Alpha and Beta confront him, Will does not care to kill them.

Will then appears later on in the game as the most difficult boss released (in KMST so far) in the sixth region of Arcane River, Esfera. He appears to be the main antagonist in the region as he is confirmed (in KMST so far) as the new lv 235 boss. His role in Esfera is currently unknown although he appears to play the part in opposition to the main character.