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Base 5–10x / Job 5–10x / Drop 2x
DungeonsIntermediate~30 min

Byalan (Undersea Tunnel)

Six-floor underwater cave off Izlude. All Water-element fish and sea creatures -- Wind/Thunder attacks are king. Floors 1-5 cover levels 35-65; floor 6 is endgame. MVP: Kraken.

An underwater cave system accessible from Byalan Island near Izlude. Six floors of Water-element fish, jellyfish, and sea creatures. One of the most popular leveling spots from mid to late game. The early floors are beginner-friendly, and the deep floors push into true late-game territory.
💡Everything here is Water element. Lightning (Wind/Thunder) attacks deal triple damage on most floors. Hunters with Thunder Arrow or Wizards with Thunder Storm absolutely destroy this dungeon.

Access

Board the ship to Byalan Island from Izlude port.
The Izlude city NPC sends you to izlu2dun (Byalan Island). From the island, walk to the cave entrance.

Floors

| Map | Display Name | Main Monsters | Recommended Level | |-----|-------------|--------------|-------------------| | iz_dun00 | Undersea Tunnel 1 | Plankton, Marina, Vadon, Kukre | 35-50 | | iz_dun01 | Undersea Tunnel 2 | Vadon, Kukre, Hydra, Marina | 40-55 | | iz_dun02 | Undersea Tunnel 3 | Cornutus, Marse, Obeaune, Hydra | 45-60 | | iz_dun03 | Undersea Tunnel 4 | Phen, Marc, Swordfish | 50-65 | | iz_dun04 | Undersea Tunnel 5 | Merman, Strouf, Swordfish | 55-65 | | iz_dun05 | Undersea Tunnel 6 | Sropho, Sedora, Pot Dofle, King Dramoh -- MVP: Kraken | 110-124 |

Floor Details

Floor 1 (iz_dun00) -- Levels 35-50

Plankton (Plankton, Lv 40, Water) and Marina (Marina, Lv 42, Water) are everywhere. Vadon (Vadon, Lv 45, Water) and Kukre (Kukre, Lv 42, Water) also appear. All Water element.

Floor 2 (iz_dun01) -- Levels 40-55

More Vadon, Kukre, and Hydra. Cornutus (Cornutus, Lv 48, Water) appears near the end of this floor range.

Floor 3 (iz_dun02) -- Levels 45-60

Cornutus (Cornutus), Marse (Marse, Lv 47, Water), and Obeaune (Obeaune, Lv 53, Water) are the main mobs. A rare Merman (Merman, Lv 60, Water) appears here.
Obeaune drops Heart of Mermaid (Heart of Mermaid) at 45% and the Obeaune Card (Obeaune Card) -- reduces Freeze duration, widely used for PvP and WoE.

Floor 4 (iz_dun03) -- Levels 50-65

Phen (Phen, Lv 52, Water), Marc (Marc, Lv 56, Water), and Swordfish (Swordfish, Lv 57, Water). Good EXP.
💡Marc card prevents Freeze. If you are hunting in ice areas (Ice Cave, Frost Diver mobs), farm Marc here first.

Floor 5 (iz_dun04) -- Levels 55-65

Merman (Merman, Lv 60, Water) and Strouf (Strouf, Lv 61, Water) are the main mobs. Deviace (Deviace, Lv 60, Water) appears rarely -- its card is very useful.
Merman drops Rough Oridecon (Rough Oridecon) at 1%, Specialty Jur related to Ancient Lips (Ancient Lips) drop at 6.5%. Merman Card lets you use Water attacks.

Floor 6 (iz_dun05) -- Levels 110-124

The difficulty jumps massively. Sropho (Sropho, Lv 113), Sedora (Sedora, Lv 110), Pot Dofle (Pot Dofle, Lv 115), and King Dramoh (King Dramoh, Lv 117) are all endgame-level mobs.
⚠️Floor 6 is for endgame players only. All monsters are Lv 110+. Do not enter if you are under level 130.
MVP: Kraken (Kraken, Lv 124, Water/Fish) is the boss of Floor 6. A massive sea monster.
Kraken drops Cardo (Cardo), Ice Falchion (Ice Falchion), Hunting Spear (Hunting Spear), and Saphien's Armor of Ocean (Saphien's Armor of Ocean). Its card (Kraken Card) has an autocasting effect on water skills.

Notable Loot Summary