BianKO's site doesn't say which dungeon or map these bosses are in. The mob pages also show no drop rate and keep old entries under the same name: Fluwiton appears under four ids, Moebius under three, Titan under three and Balrog under two. The site has 75 mob entries with a bracketed tag, and 25 of them have a drop list.

Crasher Gimmick, Furious and Fluwiton drop table

All three have 8,455 AC and a coins value of 4,978. [Emperor] Mammoth III carries the same drop list, so it's in the table too.

BianKO tagged bosses: level, HP and drops
Boss (id)LevelHPMain dropGroup drop
[Machine Golem] Crasher Gimmick (9504) 90 847,452 Warrior Pendant, Elemental Pendant 16 Chitin Shell / Complete (+1) pieces; Shard, Elixir Staff, Iron Bow, Raptor, Iron Impact (+1)
[Abyssal Guadian] Furious (9508) 90 847,452 Blessed Upgrade Scroll, Gold Bar 15 items: Ring of Life / Magic / Courage, the four class earrings, Lillimes and Leech Kings Earrings, Skeleton and Elf Belt, Scorpion Shield, Warrior / Elemental / Priest Pendant
[Shackled Lord] Fluwiton (9512) 90 847,452 Gold Bar, Silver Bar Full Plate Armor Helmet(+6) (Warrior, Priest, Rogue), Crystal Helmet(+6), Round Kite Shield(+5) plus Furious's 15 items
[Emperor] Mammoth III (9501) 83 147,452 Blessed Upgrade Scroll, Gold Bar Same 15 items as Furious

9512 is the only Fluwiton entry with drops. [Lord of Destruction] Fluwiton (9515, level 96, 2,500,000 HP) and the [Shackled Lord] Fluwiton entries 9563 (96, 1,280,000 HP) and 9566 (83, 151,014 HP) have empty drop lists and 0 coins.

Moebius, Geden and Gedon

BianKO Moebius and Sorcerer entries
Mob (id)LevelHPMain dropGroup drop
Rage of Moebius (9544) 87 8,474,520 None None
Evil of Moebius (9545) 87 8,474,520 None None
Evil of Moebius (9529) 70 12,001 Blessed Upgrade Scroll, Potion of Soul 18 items: 10 +1 weapons, five Blessed Enchant Scrolls, Blessed Immune and Reduce Scroll, Upgrade Scroll
[Sorcerer] Geden (9530) 92 668,335 None None
[Sorcerer] Gedon (9531) 70 12,001 Blessed Upgrade Scroll, Potion of Soul Same 18 items as Evil of Moebius (9529)

At 8,474,520 HP, the two big Moebius entries have the highest HP of all 1,621 mob entries, above Ultima's (6551) 7,574,520. Their pages still list no drops. The only Moebius entry with drops is 9529, with just 12,001 HP.

Titan and Balrog

Titan and Balrog carry no tag on the site, and both have more than one id.

BianKO Titan and Balrog entries
Mob (id)LevelHPMain dropGroup drop
Titan (2454) 130 80,210 Blessed Reduce Scroll, Gold Coin, Potion of Soul 39 items: +1 and +3 weapons, Chitin / Crimson (+3) pieces, Blessed Enchant Scrolls
Titan (2424) 83 51,258 Blessed Reduce, Blessed Upgrade Scroll, Potion of Soul Same 21 items as Crasher Gimmick
Titan (2404) 83 60,215 None 8 items: five Blessed Enchant Scrolls, Blessed Immune and Reduce Scroll, Upgrade Scroll
Balrog (7015) 83 84,258 Potion of Soul Same 21 items as Crasher Gimmick
Balrog (8846) 83 84,258 Blessed Immune Scroll 13 items: Advanced leather / chain / clothe / plate, Decoration jewel, Connected iron, Refined gemstone, Semiprecious stone, Exceptional (+1) weapons

Crasher Gimmick's 21-item Chitin Shell / Complete (+1) list is identical on Titan 2424, Balrog 7015 and Ultima 6501. Balrog 7015 has a coins value of 10,000, the highest of any entry listed here.

FAQ

Which dungeon is Crasher Gimmick in?
The site doesn't say. The mob page only gives level, HP, AC, coins and the two drop lists, with no zone.
Furious or Fluwiton, which one to farm?
Same level and HP. Furious gives Blessed Upgrade Scroll as a main drop, Fluwiton gives Silver Bar, and Fluwiton adds the +6 helmets and Round Kite Shield(+5) to its group list.
Did these bosses come with the April 25 update?
The special bosses added in the April 25, 2025 announcement were KING Worm, Pidama and Yellow Sand. Crasher Gimmick, Furious, Fluwiton and Moebius aren't mentioned in any announcement.

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