How do boss drops work?

A Kill Party window at the top and a party fight with blue effects
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Boss drops come as random boxes: you need at least 10% of the damage on the boss for a chance at the box. Bosses spawned from a Chaos Stone carry every boss drop as well.

The forum's boss list and its respawn list give different times for a few bosses; the tables show both values side by side with a slash.

Short answer

On OldSchoolKO the Eslant bosses respawn every 4 to 8 hours and most Colony Zone bosses every 3 to 6 hours. The strongest accessory boss is Isiloon in Hell Abyss.

Moradon, El Morad and Luferson bosses

Town and castle bosses
BossMapHPRespawnDrops
Kekurikekukaka Moradon 40,930 4-6 h Kekuri Ring, Kekuri Belt
Antares Luferson, El Morad 23,010 5-8 h Scorpion Scythe, 35 Mage Spells
Hyde Luferson, El Morad 17,790 5-8 h Sword of the Death
Atilla Luferson, El Morad 79,650 5-8 h Priest, Warrior and Elemental Pendant
OSKO Stone Luferson, El Morad, Eslant — 1-3 / 1-4 h Random boss

Atilla's coordinates in Luferson and El Morad are posted in a separate forum thread.

Eslant bosses and accessory drops

Eslant bosses
BossHPRespawnDrops
Dragon Tooth 76,380 4-8 / 3-6 h Dragon Tooth Hammer
Shaula 94,485 4-8 h Tail of Shaula, Scorpion Bow, Scorpion Shield
Samma 134,370 4-8 h Giant Axe, Giant Axe 2h
Talos 253,025 4-8 h Belt of Accessory
Troll King 258,216 4-8 h Earring of Accessory
Deruvish Founder 101,129 4-8 h Ring of Accessory
Harpy Queen 247,121 4-8 h Earring of Accessory
Snake Queen 250,072 4-8 h Necklace of Accessory

If you farm accessories, go to Eslant: Talos drops a belt and Snake Queen a necklace, Troll King and Harpy Queen drop earrings and Deruvish Founder a ring. Teleporting to Eslant needs level 60.

Colony Zone bosses

Colony Zone bosses
BossHPRespawnDrops
Lobo 77,790 3-6 h Lobo Pendant, Lobo Hammer, Lobo Staff
Lupus 78,061 3-6 h Lupus Pendant, Lupus Hammer, Lupus Staff
Lycaon 74,298 3-6 h Lycaon Pendant, Lycaon Hammer, Lycaon Staff
Lesath 95,971 3-6 h Tail of Lesath, Chitin Bow
Barkirra 76,303 3-6 h Fang of Barkirra, Sword of Beast
Orc Bandit Leader 97,348 4-8 h Holy Water of Temple
Barrk 29,155 3-6 h Tooth, High Class item
Duke 59,157 3-6 / 3-8 h Ring of Courage
Bach 60,022 3-6 / 3-8 h Ring of Life
Bishop 57,547 3-6 / 3-8 h Ring of Magic
Javana 44,520 3-6 h Javana Axe, Javana Axe 2h
Bone Collector 32,127 3-6 h Skull Hammer

The Eslant bosses also appear in Colony Zone: Talos, Troll King, Snake Queen, Harpy Queen, Deruvish Founder, Shaula and Samma come back every 7 to 8 hours there. The Chaos Stone respawns every 3 hours.

On 23 June the drop rates of Fang of Bakirra, Lobo Pendant and Holy Water of Temple went up.

Where is Isiloon and what does it drop?

Isiloon lives in Hell Abyss with 275,000 HP and 1,732 DEF, the strongest boss on the list. It drops earrings, necklaces, belts and rings of accessory; the boss list gives 8 to 12 hours for its respawn and the respawn list gives 8 hours.

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