You need serpent keys, which are hidden across the map, to unlock the Serpent box and get its schematics. That, in turn, unlocks the Nightfall Serpent Katana in Slayers 2. The Serpent Keys are scattered across the waters around Mistfall Harbor, and you must dive underwater to collect them all. Here are all 20 Serpent Key locations in Slayers 2.

Tips to Search for Serpent Keys in Slayers 2

There are no mandatory requirements for finding the Serpent Key, but these tips will make the search easier in Slayers 2.

  1. Lower graphics settings to improve underwater visibility and make the keys easier to spot.
  2. Purchase a Horse and the Mistfall Harbor Shrine. Both help you travel between locations faster.
  3. Set your spawn point in Mistfall Harbor to save time when you need to return.
  4. Stock up on Breathing Potions from Alchemist Meku to explore underwater for longer.
  5. Equip a Lantern to improve visibility while searching underwater.
  6. Mark the Serpent Chest location to make it easier to find without having to search for it every time.
Serpent Keys in Slayers 2

All 20 Serpent Key Locations in Slayers 2

Now that the preparations are complete, you must check these locations for the Serpent Key in Slayers 2. Note that the game uses RNG mechanics, so it is not necessary that the same key that unlocks the box for one player will unlock it for the next player too.

AreaLocation
WildernessOn an isolated underwater shelf
WildernessBeside rocky walls fitted with metal grates
WildernessIn deep water near the foot of the cliff
WildernessResting on the ocean floor among the other keys
WildernessOn the seabed close to two other keys
WildernessOn the ocean floor alongside nearby keys
Mistfall HarborAlong the underwater route across the seabed
Mistfall HarborBeneath the main waterwheel
Mistfall HarborUnder the watermill's submerged section
Mistfall HarborOn a sandy patch farther from shore
Mistfall HarborNear an underwater corner of the harbor wall
Mistfall HarborOn the seabed near the concrete platform
Mistfall HarborAlong the submerged foundation wall
Mistfall HarborBeyond the row of submerged pillars
ShorelineIn the shallow water near the beach
Open oceanAt the base of the underwater cliff
Harbor dockBeneath the wooden pier
Harbor dockWithin the wooden cage structure
Deep trenchOn the sandy floor of the trench
Deep trenchOn the sandy bottom of the blue-water trench

I highly recommend doing this task in daylight as it becomes impossible to see underwater at night. You can only carry one key at a time, so you will constantly have to respawn at the Mistfall Harbor Spawn point.

Also Read:

Serpent Box Location in Slayers 2

The Serpent Box in Slayers 2 contains the Nightfall Serpent Katana V2 schematic and can be unlocked using a Serpent Key. You can find the box in the Dreamfall Hollow near Mistfall Harbor. Follow these steps to locate it:

  1. Travel to the Mistfall Harbor spawn point.
  2. Head towards the Jugg NPC.
  3. Enter the Tori Gate next to Jugg.
  4. Continue forward until you find a slope on your left.
  5. Climb the slope until you reach a path covered in leaves.
  6. Walk through the leaves to enter the deep caves.
  7. Turn right inside the caves to find a set of spikes.
  8. Head towards the spikes and jump up towards the nearby light source.
  9. Find the Serpent Box next to the light source.

Try each Serpent Key until you find the correct one. Incorrect keys will snap off inside the box, so be prepared to repeat the process.

How To Craft the Nightfall Serpent Katana in Slayers 2

It took me 15 Serpent Keys to unlock the box, but the Nightfall Serpent Katana in Slayers 2 is totally worth it. The base stats are among the highest in the game, and it is fairly easy to craft. If you have the Serpent Breathing as your primary Breathing style, this Katana is a must-have. Here's what you need to craft the Nightfall Serpent Katana in Slayers 2:

  • 1x Nightfall Serpent Katana Schematic
  • 1x Serpentine Katana
  • 500x Metal Scraps
  • 500x Silk Threads
  • 500,000x Money

Higher tiers of the Nightfall Serpent Katana require obtaining rarer materials like the Nightfall Forged Ingot and Nightfall Reinforced Plating. You can obtain these from the Ouwigahara Chests.

Nightfall Serpent Katana Keys Slayers 2

Must Read:

Is the Nightfall Serpent Katana Worth Crafting?

Yes, the Nightfall Serpent Katana is totally worth crafting, especially if you have the Serpent Breathing Technique. The grind to collect the Serpent Key pays off when you check the Nightfall Serpent Katana base stats in Slayers 2. If you're in the late game, you must have at least one Nightfall or Firstlight weapon.

The Nightfall Serpent Katana is a duelist weapon, meaning an offensive playstyle benefits most. Here are some of the stats:

  • Damage: +4
  • Damage Factor: 1.17x
  • Block Points: +4.6
  • Block Regen: 2.04x
  • Max Stamina: +5

That covers all Serpent Key locations and how to craft the Nightfall Serpent Katana in Slayers 2. Make sure to check out our Slayers 2 Wiki for more guides!

FAQs

How do the Serpent Keys work on the Serpent Box?

You can only hold one Serpent Key at a time. Every time you bring a key to the Serpent Box, you must test it. If it is the incorrect key, it will snap off inside the lock, requiring you to retrieve another key until you find the right one.

Where is the Serpent Box located in Slayers 2?

The Serpent Box is hidden inside the deep caves of Dreamfall Hollow near Mistfall Harbor.

What prep work should I do before key hunting underwater?

Lower your graphics settings for improved underwater clarity, set your spawn point at Mistfall Harbor, equip a Lantern, and carry several Underwater Breathing Potions.