World Boss battle is one of the three types of Boss Battles in the game.
Mechanics[]
All players online can attack the World Boss. If you successfully defeat the World Boss, you will receive rewards based on your ranking. The World Boss is updated regularly and once the current boss dies, another boss will be ready to fight within a set amount of time.
There are three different attacks, a 1x, 10x and 50x attack. The 1x and 10x attacks use stamina, while the 50x attack uses 
10 instead. Players with a sufficient VIP level will find that they will have free 50x attacks on "ALL" World Boss.
Four World Boss Levels[]
There are 4 types of World Boss where players with specific levels can participate in.
All[]
This World Boss is a randomly selected tier 2 normal Divine Monster that all players can attack. During World Boss events, the ALL World Boss changes to plus variants along that line.
1-160[]
This World Boss can only be attacked by players that have a level of 1-80. This World Boss is a randomly selected Infinite+ Monster.
161-380[]
This World Boss can only be attacked by players that have a level of 161-380. This World Boss is a randomly selected Mystic+ Monster.
381+[]
This World Boss can only be attacked by players that have a level of 381+. This World Boss is a randomly selected Divine Monster.
Rewards[]
The world boss is the easiest way (other than buying) to obtain jewels and higher-tiered monsters. It calculates your reward based on the amount of attacks you have done to the world boss, and the total damage you have dealt. For a complete rewards list you can visit the World Boss Rewards page.
Participating in an "ALL" World Boss will also give a gift of 20 M Coins.