Blansh Seaway Walkthrough in Splatoon Raiders (Erpp Island)

Blansh Seaway is the second raid on Erpp Island in Splatoon Raiders, and it opens up once you finish the Piel Coast Treasure Hunt. It is also the first level where you can bring Gadgets into the field, since the Tank Types you earned at the end of Piel Coast are now available. Clearing it comes down to locating three treasure crystals, defeating the Salmonids guarding each one, and having Big Man mine them.

Quick answer: Scan for treasure after landing, follow the three pings along the beach, defeat the Salmonids at each crystal (including the new Spinook, Salivator, and Tong Chum), and instruct Big Man to mine all three crystals. Breaking the third one awards the Briny Scroll.

What to expect before you start

This raid introduces several enemies you have not seen yet, so pace your fights and use the terrain. The beach has elevated spots and floating plants that help you reposition, and there are green balloons and shard pillars scattered around for extra materials. Big Man remains your mining partner and can also boost you toward pillars that are out of normal reach.

New enemy	Where it appears	How to handle it
Spinook	Near the first crystal	Clear alongside the other Salmonids guarding the crystal
Salivator	Along the beach before the second crystal	They fly, so shoot from raised ground to hit them easily
Tong Chum	After jumping to the next island section	Tough swarm fight; lean on Big Man’s support
Shinook	On the beach before the third crystal	Beat all four before heading up the ramp

First crystal: near the giant plant

Once you land on Erpp Island, start scanning for treasure. Three pings appear, and the nearest one sits by a plant close to your landing spot.

Scanning for treasure after landing on Erpp Island — Start scanning as soon as you arrive on Erpp Island. Image: Nintendo

Follow Shiver’s suggestion and jump toward the plant, then hop over the ledge. A group of Salmonids waits below, including the level’s first new type, the Spinook.

Heading toward the giant plant for the first treasure — Make your way to the giant plant to reach the first crystal. Image: Nintendo

Take out every Salmonid with your weapon, then ask Big Man to mine the crystal they were protecting. That secures the first treasure.

Big Man mining the first treasure crystal — Big Man mines the crystal once the guards are cleared. Image: Nintendo

Second crystal: across the plant jumps

Keep moving down the beach until you meet the Salivator, another new Salmonid. These enemies can fly, so stand on the raised parts of the beach to line up your shots more easily. Defeat all three, then continue to the plant.

Facing the flying Salivator on the beach — Use higher ground to deal with the airborne Salivator. Image: Nintendo

While airborne, pop the green balloons for extra shards. Use the three plants to bounce across to the next island area, where a swarm ambushes you, including the new Tong Chum. This is a demanding fight even with Big Man assisting, so stay focused.

Using the plants to jump to the next island section — Chain the plant jumps to cross to the next stretch of island. Image: Nintendo

After the swarm is down, tell Big Man to harvest shards from the second crystal.

Third crystal: the tornado area and the Briny Scroll

Push forward and beat the four Shinook waiting on the beach. Once they are cleared, head to the ramp, where a small tornado spins at the top.

The mini tornadoes let you float short distances in kid form. Use them to explore, grabbing every shard you can, and call on Big Man to reach the pillars that sit further out. Work your way toward the third crystal.

A large group of Salmonids defends the final crystal, and it is easy to get overwhelmed here. Hold your ground, clear them all, then have Big Man mine the crystal.

Breaking the third crystal for shards and rewards — Breaking the final crystal drops the Briny Scroll and extra items. Image: Nintendo

Cracking that third crystal rewards the Briny Scroll along with additional items such as Gadget Parts. Once you see the Briny Scroll added to your haul, Blansh Seaway is complete and you can head back out to your next raid.