Boss system:
 The first boss will spawn in CF and after it dies another boss will be spawned in a Realm world.
After the Realm World boss dies, another CF boss will spawn.
A total of 12 bosses will spawn in a cycle, 6 of them in Chaotic Frontier maps and 6 in Realm Worlds.
After all 6 bosses dies, next bosses will start spawning at next period The drops of the bosses according to the spawn zone are as follows:

Forest of Scream - Lapan [E] Level 40 Boss drops:

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Land of Ice -  Frost Golem Boss [E] Level 47 Boss drops:

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Dungeon 1F - Kalidan [E] Level 55 Boss drops:

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Forest of Pain - Gespen [E] Level 68 Boss drops:

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Tower of Despair - Murad [E] Level 70 Boss drops:

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Ice World - lvl 96 Boss drops:

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Lightning World - lvl 96 Boss drops:

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Poison World - lvl 96 Boss drops:

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During the cycle, Devil [E] will randomly spawn in Ice, Lightning and Poison World
It will be very easy to kill and Archonia's Gift will drop
Archonia's Gift contains: