Illusion of Underwater
✦ UPDATE 2026. 8. 19. ✦
Target: LV.230 and above
Uncover the secret of the endlessly deep undersea cave!
Three months have passed since a young man named Sirude, who was fishing in Izlude, went missing in an unsolved case. Sirude's belongings were discovered at the Izlude fishing spot. Sirude's friends ask for help once again to find him.
✦ Main Quest ✦
[Rake] Why was this only discovered now? Could this be a message from someone?
Next
[ Starting Location: Geffen ( izlude 132 49 ) ]
When the 
Fishing Rod belonging to 'Sirude', who went missing three months ago, is discovered,
his friends request an investigation from the oceanographer Jerimon.
After tracking the trail, they arrive at a mysterious underwater cave that can breathe and move with mysterious power. The adventurer sets out to explore alongside oceanographer Jerimon in search of Sirude. Once again, the Illusion Investigation Team joins in support.
Quest | New Items | Random Options
✦ Repeatable Quests ✦
| Quest | Objective |
|---|---|
| Hunt Upper Level Deep Sea Creatures | Defeat  Deep Sea Sropho,  Deep Sea Deviace,  Deep Sea Marse10 of each |
| Hunt Lower Level Deep Sea Creatures | Defeat  Deep Sea Swordfish,  Deep Sea Phen,  Deep Sea King Dramoh10 of each |
| Hunt Lower Level Merfolk | Defeat  Deep Sea Sedora,  Deep Sea Strouf10 of each |
| Defeat 100 Illusion of Underwater | Defeat 100 monsters in the Abyssal Underwater Cave Lower Level dungeon |
Quest | ✦ New Items ✦ | Random Options
✦ Equipment ✦
Equipment can only be obtained through monster drops, and options are randomly generated upon drop.
New Equipment (Headgear) Items
| Image | Description |
|---|---|
 Illusion Investigation Team Fin Helm |
A helmet shaped like a fish fin. Just because you wear it doesn't mean you can breathe underwater, so be careful. ATK + 148, MATK + 148. Increases physical/magical damage dealt to monsters appearing in Illusion of Underwater by 10%. Type: Headgear | Defense: 30 | Location: Middle | Weight: 20 | Required Level: 230 Equip: All Jobs | SLOT:0 |
 Fish In Mouth |
A fish made to be held in the mouth. It has a slight fishy smell, but it's been specially treated so it won't spoil. ATK + 51, MATK + 51. Increases physical/magical damage dealt to monsters appearing in Illusion of Underwater by 10%. Type: Headgear | Defense: 10 | Location: Lower | Weight: 20 | Required Level: 230 Equip: All Jobs | SLOT:0 |
✦ Cards ✦
New Additional Cards
| Card | Description | Acquisition Method |
|---|---|---|
| Deep Sea Sropho Card |
Increases Wind property magic damage by 3%. At weapon refine +9, additionally increases Wind property magic damage by 2%. At weapon refine +11, additionally increases Wind property magic damage by 5%. Type: Card | Equip: Weapon | Weight: 1 | Price: 20 |
Dropped by Deep Sea Sropho |
 Deep Sea Obeaune Card |
MATK + 30. Increases magic damage dealt to Water property enemies by 15%. Type: Card | Equip: Accessory | Weight: 1 | Price: 20 |
Dropped by Deep Sea Obeaune |
| Deep Sea Deviace Card |
Increases physical damage dealt to Water property enemies and Fish race monsters by 5%. At weapon refine +7, additionally increases physical damage dealt to Water property enemies by 5%. At weapon refine +9, additionally increases physical damage dealt to Fish race monsters by 5%. Type: Card | Equip: Weapon | Weight: 1 | Price: 20 |
Dropped by Deep Sea Deviace |
| Deep Sea Marse Card |
Reduces physical/magical damage received from Earth property enemies by 15%. Reduces physical/magical damage received from Insect race monsters by 15%. Type: Card | Equip: Shield | Weight: 1 | Price: 20 |
Dropped by Deep Sea Marse |
 Deep Sea Merman Card |
ATK + 4 per 15 pure STR. When equipped together with Deep Sea King Dramoh Card, increases Critical Damage by 15%.Type: Card | Equip: Shoes | Weight: 1 | Price: 20 |
Dropped by Deep Sea Merman |
 Deep Sea Witch Card |
Increases Fire and Shadow property magic damage by 100%. Reduces resistance to all elemental attacks by 30%. Type: Card | Equip: Garment | Weight: 1 | Price: 20 |
Dropped by Deep Sea Witch |
| Deep Sea Sedora Card |
Increases Critical chance against Fish race monsters by 30%. When equipped together with  Sedora Card, increases Critical Damage by 15%.Type: Card | Equip: Weapon | Weight: 1 | Price: 20 |
Dropped by Deep Sea Sedora |
| Deep Sea Swordfish Card |
Increases resistance to Water property attacks by 10%. At refine +9, increases magic damage dealt to Water property enemies by 10%. When equipped together with  Swordfish Card, MATK + 10%.Type: Card | Equip: Headgear | Weight: 1 | Price: 20 |
Dropped by Deep Sea Swordfish |
| Deep Sea Strouf Card |
MHP + 10%, MSP + 5%. At refine +9, increases physical/magical damage dealt to Water property enemies by 5%. When equipped together with Deep Sea Deviace Card, ATK + 30.When equipped together with Deep Sea Sropho Card, MATK + 30.Type: Card | Equip: Armor | Weight: 1 | Price: 20 |
Dropped by Deep Sea Strouf |
| Deep Sea Phen Card |
Increases resistance to Neutral property attacks by 15%. Increases Wind property magic damage by 3% per refine level. When equipped together with Deep Sea Obeaune Card,additionally increases resistance to Neutral property attacks by 5%. Type: Card | Equip: Garment | Weight: 1 | Price: 20 |
Dropped by Deep Sea Phen |
| Deep Sea King Dramoh Card |
MHP - 5%. ATK + 2% per 3 refine levels. When equipped together with  King Dramoh Card, STR + 4, MHP + 15%.Type: Card | Equip: Headgear | Weight: 1 | Price: 20 |
Dropped by Deep Sea King Dramoh |
 Deep Sea Kraken Card |
Increases ranged physical damage by 35%. 5% chance to trigger a homing attack. Type: Card | Equip: Weapon | Weight: 1 | Price: 20 |
Dropped by Deep Sea Kraken |
Random Option NPC Random Options and Enchant
Quest New Items ✦ Random Options ✦
◆ Random Options and Enchant ◆
[Random Option NPC] [Random Options and Enchant]
Random Option Re-granting
You can re-grant random options to equipment through [Horen].
| NPC | Horen |
|---|---|
| NPC Location | izlude.gat 123 55 |
| Function | Re-grant random options / Grant random options using  Abyssal Essence as material |
Random Option Target Equipment Information
Random Option Granting (per attempt)
| Target Equipment | Option Granting | Random Option Material |
|---|---|---|
| Illusion Investigation Team Fin Helm |
Guaranteed option granted (1 option) Random option granted (0~3 options) |
8 Abyssal Essence |
| Fish In Mouth |
Guaranteed option granted (1 option) Random option granted (0~2 options) |
8 Abyssal Essence |
Enchant and Reset
You can enchant and reset equipment using Zeny through [Horen].
| NPC | Horen |
|---|---|
| NPC Location | izlude.gat 123 55 |
| Function | Enchant and Reset / Enchant and Reset possible using Zeny |
- Equipment is not destroyed upon enhancement failure
- From stage 2 onward, there is a chance of dropping 1 stage upon enhancement failure (fixed at 3% chance)
- Up to stage 3, there is a chance of rising 2 stages upon enhancement success (fixed at 1% chance)
Enchant Target Equipment Information
Random Enchant Granting (per attempt) - 4 slots must be granted before 3 slots can be granted Enchants can be enhanced (each exists up to stage 5 / same materials required)
| Target Equipment | Enchant Slot | Enchant Material |
|---|---|---|
| Illusion Investigation Team Fin Helm |
4 Slots | 1,500,000 Zeny |
| Fish In Mouth |
4 Slots | 1,500,000 Zeny |
Random Enchant Granting (per attempt) - 3 slots must be granted before 2 slots can be granted Enchants can be enhanced (each exists up to stage 5 / same materials required)
| Target Equipment | Enchant Slot | Enchant Material |
|---|---|---|
| Illusion Investigation Team Fin Helm |
3 Slots | 1,500,000 Zeny |
| Fish In Mouth |
3 Slots | 1,500,000 Zeny |
Random Enchant Granting (per attempt)
| Target Equipment | Enchant Slot | Enchant Material |
|---|---|---|
| Illusion Investigation Team Fin Helm |
2 Slots | 1,500,000 Zeny |
| Fish In Mouth |
2 Slots | 1,500,000 Zeny |
Enchant Reset (per attempt)
| Target Equipment | Enchant Slot | Reset Material |
|---|---|---|
| Illusion Investigation Team Fin Helm |
Slots 2, 3, 4 | 500,000 Zeny |
| Fish In Mouth |
Slots 2, 3, 4 | 500,000 Zeny |