Devil Square is a legendary battlefield and one of MU’s most famous training arenas. Once a place of dread, it now serves as a proving ground for warriors seeking power. The Immoral Tree, a cursed entity, spawns waves of relentless monsters at specific times throughout the day, challenging participants to endure and defeat the hordes. Unlike traditional battles, warriors face no penalty upon death, allowing them to fight fearlessly and push their limits. What was once seen as a burden of war has now become a valuable training ground, attracting the bravest adventurers looking to hone their skills in an unrelenting combat scenario.