Sacred Ocean Tunnel

Overview

UnlockClear Serpentcoil Island → Attempt Training Path of Inference once.
EntranceRocky Viewpoint (Window into the ocean)
Floors15F
Bring ItemsNoAlliesNo
Rescues3Starting LevelLv1
Starting ItemLarge Onigiri
UnidentifiedEquipment, Scrolls, Grass, Staves, Pots
ShopsYesMonster HousesRegular
Kron's ChallengeYesFever Time
Initial EnemiesSpawn Rate
Wind of Kron900RewardRandom Sacred Item (Gold)

Postgame dungeon where all weapons and shields found on the ground are sacred items.
Silverpurge Scrolls and Synthesis Pots are common, but crowd-control items are rare.
The player is not allowed to take home any inventory items upon clearing the dungeon,
but they will receive 1 random gold sacred item as a reward instead.

Strategy

General

The main idea is to find high stat sacred items and synthesize them to merge runes.
Silverpurge Scroll and Synthesis Pot are common, so it's fine to insert ingredients into unidentified pots.
On the other hand, crowd-control items that help in Monster Houses or such are extremely rare.
Bracelets and staves don't appear on the ground, so you need higher stats to trade hits with monsters.
Prioritize runes that let you attack in additional directions, along with payback style runes.

Lastly, remember that you cannot take home any inventory items even if you clear the dungeon.
There's zero reason to save synthesis ingredients or rare equipment in this dungeon.

Important Items

Equipment

Use sacred items with high base stats as your main equipment instead of choosing based on runes.
Aim for a minimum of 10 item strength, 15 is comfortable, and 20 pretty much ensures safety.
If your stats are too low, you'll struggle against Mid Chintala (3-10F) and other enemies from 5F.
Whopping Harisen + Zabuton has fantastic resonance, so it can be worth using despite lower stats.

Equipment is common, so there's a higher risk of equipping a cursed item if you check every item.
If you just want to check upgrade value, use a Synthesis Pot and synthesize the items instead,
since weapons or shields that synthesize successfully will automatically become identified.

Weapon Runes

Frontal Attack, Side Attack, Back Attack
Frontal Attack = Kama Itachi, Side Attack & Back Attack = Sacred Item.
One of the very few ways you can deal with crowds of enemies in this dungeon.
The ability to attack around corners also comes in handy.

Knockback
Knockback = Whopping Harisen.
Roughly 50% chance to deal 1 tile of knockback, which can also be used to one-shot Ghost Samurai.

Anti-Ghost, Flame Shot, Thunderbolt
Anti-Ghost = Sickle of Salvation, Flame Shot & Thunderbolt = Sacred Item.
Runes that help against Ghost Samurai, which spawns after Masked Samurai (5-10F) is defeated.

Anti-Beast, Anti-Cyclops, Swift Strikes, Critical At N
Anti-Beast = Primal Axe, Anti-Cyclops = Cyclops Bane, Swift Strikes = Swift Sword, Critical At N = Sacred Item.
Anti-Beast is nice for Mid Chintala and Tiger Thrower, Anti-Cyclops helps against Gazer and Metalhead.
Swift Strikes and Critical At N runes can increase damage output against any opponent.

Shield Runes

Delusion Payback, Onigiri Payback, Jitter Payback, Leap Payback, Shadow Payback
Onigiri = Onigiri Scroll, Jitter = Jitters Scroll, Leap = Leaping Grass, Delusion & Shadow = Sacred Item.
Runes that can be helpful if you happen to become surrounded by enemies.
Can be synthesized anytime if found on sacred items, but otherwise Mixers (8-9F) are your only chance.

Keen, Full Armor, Tough At N, HP +N
Keen = Watchful Shield, Full Armor = Hunky-dory Shield, Tough At N & HP +N = Sacred Item.
Runes that help with survivability against any opponent.

Other Items

Silverpurge Scroll, Synthesis Pot
Don't use these items without thinking, but instead plan out the runes you want to transfer.

Rotten Onigiri
Throw this at an enemy to inflict a bad status condition on them.
Possible status conditions include Weakened, Confused, Asleep, Blind, or Deluded.

Exorcism Scroll, Fixer Scroll, Onigiri Scroll, Plating Scroll
Scrolls that can be used to remove a cursed weapon or shield - Don't expect to find multiple copies.

Blank Scroll
It's probably best to save this for a potential Monster House.
Some like to write Sanctuary Scroll on it to make it easier to synthesize using Mixers (8-9F),
or to make it easier to level up on floors where Masked Samurai (5-10F) spawns.

Poison Arrow, Rock
Try to save rocks for Behemoth Monsters (10-13F), even if you find the Anti-Behemoth rune.
Normal attacks can miss, so relying on Anti-Behemoth instead of rocks introduces unneeded risk.

Traps

Silver-seal Trap
Can be used to better control which runes transfer when synthesizing weapons or shields.
Example: Picked up a Kama Itachi which has a Dulling rune on it.
1. Equip a spare weapon and step on the Silver-seal Trap until only 1 open slot remains.
2. Synthesize the Kama Itachi into the spare weapon, transferring only Frontal Attack.
3. Synthesize the spare weapon into your main weapon.

Floor Guide

1-2F

Enemies can be defeated without equipment, so check all rooms on these floors in search of equipment.
If you're worried about curses, only equip the best weapon and shield you found at the end of 2F.

3-4F

Pumphantasm (23 HP, 16 atk, 10 def) and Mid Chintala (45 HP, 23 atk, 10 def) are notable threats.
Despite being so early in the dungeon, it can be quite rough if you haven't found a decent shield.
Gazer (30 HP, 18 atk, 14 def) also appears on 4-5F - Use projectiles to avoid being hypnotized.

5-10F

Generally considered the most difficult floor range of this dungeon (10F can spawn a Behemoth Gate).
If you found a Blank Scroll, consider writing Sanctuary on it to safely level up + synthesize on 8-9F.
Be warned that attempting to synthesize via Mixers without a Sanctuary Scroll can easily end runs.

Notable threats:

Curse Girl (65 HP, 28 atk, 28 def) curses your equipped shield - 5~10F.
Masked Samurai (47 HP, 18 atk, 18 def) spawns a Ghost Samurai when defeated - 5~10F.
Bowboy (45 HP, 17 atk, 18 def) can be a problem if it appears alongside another monster - 7~10F.
Mixer (78 HP, 39 atk, 29 def) has very high attack power, especially after eating items - 8~9F.

11-13F

Behemoth Gates continue to have a chance of being generated on each of these floors.
Use items like Leaping Grass or Rocks to avoid becoming sandwiched by Behemoth Monsters.
Otherwise, normal monsters are mostly power types like Floor Dragon, Metalhead, and Tiger Thrower.
Lv1 Shagga appears instead of Lv2 Nashagga, which might be a mistake on the developer's part.

14-15F

Basically the same monsters as 11-13F, but with the addition of lowest rank monks and no Behemoths.
The more you linger, the greater chance a monster will level up due to Berserk status and such.
You can't take inventory items home anyway, so just rush to the stairs as fast as possible.

Monsters

See Monsters for individual monster details.

  • F - Dark hallways
  • S - Shop is possible
  • H - Monster House is possible
  • G - Golden Egg Thing is possible
  • B - Behemoth Monsters are possible

Monster Colors = Farming, Useful, Lowers Stats, Targets Items, Dangerous

F S H G Monsters B
1 1 1 Mamel 3 1 Octopling 4 1 Spearfish
2 1 1 Mamel 1 2 Pit Mamel 3 1 Octopling 4 1 Spearfish 14 1 Shagga
3 1 2 Pit Mamel 2 1 Chintala 6 1 Pumphantasm 8 1 Armordillo 2 2 Mid Chintala
14 1 Shagga
4 2 1 Chintala 6 1 Pumphantasm 8 1 Armordillo 22 1 Gazer 2 2 Mid Chintala
14 1 Shagga
5 8 1 Armordillo 25 1 Scorpion 22 1 Gazer 40 2 Hoppin' Hitter 2 2 Mid Chintala
9 1 Masked Samurai 14 1 Shagga 23 1 Twisty Hani 31 1 Curse Girl
6 25 1 Scorpion 40 2 Hoppin' Hitter 2 2 Mid Chintala 9 1 Masked Samurai 23 1 Twisty Hani
31 1 Curse Girl
7 25 1 Scorpion 40 2 Hoppin' Hitter 2 2 Mid Chintala 15 1 Bowboy 9 1 Masked Samurai
3 2 Fresh Octopling 23 1 Twisty Hani 31 1 Curse Girl
8 40 2 Hoppin' Hitter 2 2 Mid Chintala 15 1 Bowboy 9 1 Masked Samurai 3 2 Fresh Octopling
45 1 Mixer 23 1 Twisty Hani 31 1 Curse Girl
9 40 2 Hoppin' Hitter 2 2 Mid Chintala 15 1 Bowboy 9 1 Masked Samurai 3 2 Fresh Octopling
45 1 Mixer 23 1 Twisty Hani 31 1 Curse Girl
10 2 2 Mid Chintala 15 1 Bowboy 9 1 Masked Samurai 3 2 Fresh Octopling 23 1 Twisty Hani
31 1 Curse Girl
11 14 1 Shagga 4 2 Lt. Spearfish 35 1 Floor Dragon 12 1 Metalhead 36 1 Tiger Thrower
12 14 1 Shagga 4 2 Lt. Spearfish 35 1 Floor Dragon 12 1 Metalhead 36 1 Tiger Thrower
13 14 1 Shagga 35 1 Floor Dragon 12 1 Metalhead 36 1 Tiger Thrower 44 1 N'dubba
14 14 1 Shagga 4 2 Lt. Spearfish 35 1 Floor Dragon 12 1 Metalhead 36 1 Tiger Thrower
58 1 Kitsune Monk D 59 1 Okina Monk D 60 1 Okame Monk D 61 1 Tengu Monk D 57 1 Hannya Monk D
44 1 N'dubba
15 35 1 Floor Dragon 12 1 Metalhead 36 1 Tiger Thrower 58 1 Kitsune Monk D 59 1 Okina Monk D
60 1 Okame Monk D 61 1 Tengu Monk D 57 1 Hannya Monk D 44 1 N'dubba

Items

  • F = Floor
  • S = Shop
  • P = Peddler
  • M = Monster drop
  • B = Buried
  • H = Thiefwalrus
  • I = Island
  • T = Transmutation Pot
  • U = Surprise Pot
  • W = Tunnel of Wishes

Weapon

Weapon
NameFSPMBHITUW
Wooden Sword
Bronze Sword
Katana
Doutanuki
Manji Kabura
Kajin Fuuma
Kabura Sutegi
Golden Sword
Kama Itachi
Axe of the Minotaur
Accurate Sword
Swift Sword
Watersplitter
Primal Axe
Dragonkiller
Crescent Blade
Sky Sword
Sickle of Salvation
Drain Slayer
Cyclops Bane
Steel Severer
Whopping Harisen
Healing Sword
Peach Club
Spender's Club
Ferrous Greatsword
Steak Knife
Jagged Sword
Quad-edge
Auspicious Kumade
Pickaxe
Golden Pickaxe
Wooden Mallet
Epic Hammer
Trapseeker
Bonito Block
Yamanba's Cleaver
Break-Off Blade

Shield

Shield
NameFSPMBHITUW
Wooden Shield
Bronze Shield
Iron Shield
Wolfshead
Fuuma Shield
Rasen Fuuma
Golden Shield
Counter Shield
Watchful Shield
Dragon Shield
Blast Shield
Targe of the Minotaur
Walrus Stopper
Froggo Stopper
Hat Stopper
Nigiri Stopper
Spearscale Shield
Kappa's Dish
Gazer Shield
Shield of Negation
Unmoving Wall
Zabuton
Spender's Shield
Ferrous Kite
Steak Plate
Gutsy Shield
Hunky-dory Shield
Bodhi Shield
Shield of Sating
Auspicious Omamori
Shield of Presage
Yamanba's Potlid
Break-Off Shield

Bracelet

Bracelet
NameFSPMBHITUW
Healing Bracelet
Strength Bracelet
Bellyexpand Bracelet
Bellyshrink Bracelet
Fortune Bracelet
Cleansing Bracelet
Focusing Bracelet
Rousing Bracelet
Rustproof Bracelet
Cursebreak Bracelet
Affixing Bracelet
Far-throwing Bracelet
Bad-aim Bracelet
Sure-aim Bracelet
Bouncy Bracelet
Rapid-fire Bracelet
Daredevil Bracelet
Dreaded Bracelet
Leaping Bracelet
Blasting Bracelet
Clairvoyant Bracelet
Monster-find Bracelet
Item-find Bracelet
Passage-find Bracelet
Waterwalk Bracelet
Floating Bracelet
Wallpass Bracelet
Tiptoe Bracelet
Passerby Bracelet
Item-losing Bracelet
Gitan-losing Bracelet
Monstercall Bracelet
Trapmore Bracelet
Haggling Bracelet
Trapper's Bracelet
Appraiser's Bracelet
Cannonboost Bracelet

Projectile

Projectile
NameFSPMBHITUW
Wooden Arrow
Iron Arrow
Silver Arrow
Poison Arrow
Truestrike Arrow
Rock
Porky's Rock

Food

Food
NameFSPMBHITUW
Onigiri
Large Onigiri
Huge Onigiri
Rotten Onigiri
Grilled Onigiri
Special Onigiri
Sumo Onigiri
Sweet Potato
Yakitori
Rotten Peach Bun

Grass

Grass
NameFSPMBHITUW
Weeds
Herb
Otogirisou
Healing Grass
Life Grass
Fragrant Grass
Revival Grass
Bellyexpand Seed
Bellyshrink Seed
Dragon Grass
Leaping Grass
Antidote Grass
Strength Grass
Poison Grass
Confusion Grass
Sedating Grass
Berserk Seed
Blinding Grass
Seewell Grass
Swift Grass
Power-up Grass
Invincible Grass
Fortune Grass
Angel Seed
Feeble Grass
Unlucky Seed
Ill-fated Seed

Scroll

Scroll
NameFSPMBHITUW
Confusion Scroll
Slumber Scroll
Jitters Scroll
Windblade Scroll
Expulsion Scroll
Exorcism Scroll
Identifier Scroll
Heavenly Scroll
Earthly Scroll
Plating Scroll
Slot-adding Scroll
Rune-eraser Scroll
Silver-seal Scroll
Silverpurge Scroll
Pot-upsize Scroll
Extraction Scroll
Onigiri Scroll
Curse Scroll
Mapping Scroll
Map-loss Scroll
Trap-eraser Scroll
Trap Scroll
Water-drain Scroll
Monstercall Scroll
Wall-less Scroll
Gathering Scroll
Collection Scroll
Gambler's Scroll
Muzzle Scroll
Carry-ban Scroll
Swift Foe Scroll
Fixer Scroll
Escape Scroll
Eradication Scroll
Sanctuary Scroll
Blank Scroll
Wet Scroll

Staff

Staff
NameFSPMBHITUW
Ordinary Staff
Paralyzing Staff
Sealing Staff
Disguising Staff
Empathetic Staff
Narrow-escape Staff
Knockback Staff
Switching Staff
Vaulting Staff
Skull Mage's Staff
Thunderbolt Staff
Burrowing Staff
Earthmound Staff
Balance Staff
Guiding Staff
Swift Staff
Sluggish Staff
Fortune Staff
Unlucky Staff
Peach Staff

Pot

Pot
NameFSPMBHITUW
Preservation Pot
Identifier Pot
Transmutation Pot
Cashing Pot
Synthesis Pot
Exorcism Pot
Curse Pot
Upgrading Pot
Degrading Pot
Bottomless Pot
Warehouse Pot
Handtrapper Pot
Unbreakable Pot
Ordinary Pot
Hiding Pot
Rejuvenation Pot
Walrus Pot
Water Gun Pot
Hilarious Pot
Monster Pot
Surprise Pot

Incense

Incense
NameFSPMBHITUW
Heat-ban Incense
Evasive Incense
Cautious Incense
Reflective Incense
Aggressive Incense
Defensive Incense
Blurry Incense
Weighted Incense
Unwanting Incense