All our mu online bosses don't have an exact timing, but a relative one. This to prevent macro hunting so real players will gain the rewards!
Our boss list: ( not complete, have to explore for run )
Medusa +- 1 hour
Ice King +- 1,5 hour
Rathian +- 1 hour
Golden Rathian +- 2 hours
Valkerie +- 1 hour
Kundun +- 1 hour
Erohim +- 1 hour
Balgass +- 1 hour
Fire Valkerie +- 4 hours
Enhanced Balrog +- 3 hours
Boss Rathian +- 3 hours ( WINNER GETS 1.000 PREMIUM GOLD COINS HOT! ) ( Spawns at Swamp of calmness, Nars, Vulcan, Bosszone )
Scorn Dragon +- 6 hours ( WINNER GETS 20.000 GOLD COINS - HOT! ) ( Spawns at tarkan3, LOT)
PLAYERS WHO KILLS THE BOSS GETS THE GOLD COINS ( OTHER ITEMS LIKE WCOIN BOXES DROPS ASWELL, OTHER PLAYERS CAN PICKUP THIS UP )
Many of our bosses drop custom ancient items, and or WCOINS or RUUD, and have a relatively small respawn time. This way players can get fairly a good custom ancient item to match up the Premium bosses. Party and Guilds are needed to hit on the PREMIUM TOP BOSSES. But the rewards are worth it!