The table comes from the /guide/mobs pages on BianKO's own website. The site doesn't list where or when field bosses spawn, and the mob pages carry no drop rates. The database also holds old unused entries: six field bosses appear under two ids with the same name.

BianKO field boss table

BianKO field boss list: entries 8643–8664 (by level)
Field Boss (id)LevelHPMain drop
Bandiking (8645) 10 120 Bandicoot Belt
Hideous (8643) / Kekurikang (8644) 10 100 —
Keshark (8647) 20 600 —
Gavoltin (8646) 30 500 Gavolt Earring
Wolfraiger (8649) / Byzombie (8650) 40 3,000 —
Omegatron (8651) 50 3,000 —
Skelcrown (8652) 50 5,000 —
Scolaid (8648) 60 800 Pincers scorpion Pendant
Kamicollo (8655 / 8661) 65 9,000 Colmicolas Essence
Lapiona (8654 / 8660) 70 6,000 8654: Lamia Earring; 8660: —
Garukonga (8653 / 8659) 70 8,000 8653: —; 8659: GaruKongas Essence
Urukthrone (8656 / 8662) 70 15,000 Urkthrons Essence
Alkedrada (8657 / 8663) 70 20,000 Alkeradeuas Essence (8663 also has a group drop)
Trethorns (8658 / 8664) 70 30,000 Trethonzs Essence

Alkedrada (8663) is the only field boss entry with a group drop: Low Quality Gem, Blessing Potion, Prayer of gods power, Styx, Flame / Glacier / Lightning Resistance Potion, Crystal, Opal and Elemental Scroll (Middle Class Item).

What are the Essences for

Five field bosses drop a named Essence: Colmicolas, Urkthrons, Alkeradeuas, Trethonzs and GaruKongas Essence. The site doesn't list what they're used for or which NPC takes them, and they don't appear on the Gems and Fragments Drop page either.

Field boss entries with no drops

Ids 9262–9276 hold six more [Field Boss] entries: Contaminated Lamiros, Contaminated Garukonga, Legendary Old Tree, Ancient Trethorns, Mana Predator and Shadow of Krowaz. All are level 12 with 114 HP and empty drop lists. Inside 8643–8664, Hideous, Kekurikang, Keshark, Wolfraiger, Byzombie, Omegatron and Skelcrown have no drops either.

Are field bosses worth it at level 83

The April 28, 2025 patch fixed the starting level at 83. The highest field boss is level 70, so treat them as a source of accessories and Essences. For Blessed scrolls, KC vouchers or +1 accessories, the level 80–83 bosses on the boss list are the better targets.

FAQ

When do field bosses spawn on BianKO?
The site doesn't list it. Events are said to follow a weekly calendar, but no calendar or field boss timer is published.
Where do BianKO field bosses spawn?
Mob detail pages show no zone, and none of BianKO's news posts name a field boss map.
Why is the same field boss listed twice?
Kamicollo, Lapiona, Garukonga, Urukthrone, Alkedrada and Trethorns each have two ids. Level and HP match, drops partly differ, and the page doesn't show which one spawns in game.
Is Shadow of Krowaz the same as Krowaz?
No. Shadow of Krowaz (9276) is a level 12, 114 HP entry with no drops. The Krowaz that drops Nightmare Crystal is id 8866 at level 150.

Related guides