Season 17 did something MU had never done: it shipped two new characters together. The demonic Kundun Mephis and the elemental mage Lemuria arrived alongside the Kethotum battlegrounds, the Kanturu Underground Facility and a renewed pet fairy system.
Playing as a vessel of the great demon himself, Kundun Mephis brought dark burst damage, while Lemuria offered refined elemental spellwork. Both launched with 4th wings and full equipment lines within the season.
A pair of mirrored maps — one ablaze, one ancient — designed for the new characters' leveling path, followed by additional maps and a hunting-ground rebalancing pass.
Part 2 dug beneath the classic Kanturu, adding an underground complex with a 4th Guardian boss and its own elite zone — nostalgia and new mechanics in one.
The helper fairy was rebuilt into a proper progression companion, and 5th mastery earrings continued the accessory race, alongside 7th weapons and 8th armor.