There are 9 default bosses and 8 special event bosses.

Bosses spawn randomly in different areas around rucoy.

When people find bosses its usually from boss calls.

Boss calls are when a player finds a boss randomly then tells his guild and

his friends list the server and location of the boss.

Special bosses can spawn on Irl events such as Halloween, Christmas, and Easter.

Bosses are strong highly recommended that you be 375+ base/level before fighting one unless its a lower tier boss.