Every game has a terrifying location, andAnother Crab’s Treasureis no exception. Kril finds himself in The Unfathom, a dark, deep-sea area filled with primitive sea creatures. Moreover, since you are in the very depths of the ocean, it is an extremely dark place compared to other areas. So, in addition to hostile sea creatures, the environment itself is also your enemy.

To leave this place as soon as possible, you need to find a Moon Snail Shell, so maybe you can once again see the beautiful atmosphere of New Carcinia. However, to leave here, you must defeat one of the main story bosses, Petroch, The False Moon.

Another Crab’s Treasure - Kril is next to a pink swirling mist in The Unfathom

Where To Find Petroch, The False Moon

First, when you’ve fallen into The Unfathom, there are two things you should do before finding Petroch:

Doing these will help youbecome more familiar with the mapand make finding Petroch easier. Searching for him blindly is definitely not easy. Until you defeat Petroch in The Unfathom, youwon’t have access to any Moon Snail Shells.Thus, each time you die, you will start at the dollar stack with a Heartkelp Pod near Nemma.

Another Crab’s Treasure - Kril is walking in a corridor with white sea plants

First, head north from this area.Go through the shortcut dooryou previously unlocked. Then, proceed to the blue shimmer in the northwest. This isan anglerfish hiding under the sand.If you don’t want to fight it, go around it. After progressing far enough to the northwest, keep the cliff on your right and go a bit west. When you turn northwest again, you’llsee a stone pillar.

Jump across the stone pillars to the other side. You’ll arrive at the pinball machine area.Keep the cliff on your rightagain and head north. Continue to the end of the area with the cliff on your right until yousee the pink Umami mist swirland stop there. Now,head towards the pink glowsticknortheast. Cross over and move a bit forward to see another pink glowstick.

Another Crab’s Treasure - Kril is 36 level and his stats are displayed on screen

Head towards it. After the second glowstick,reach the yellow glowstickin the southeast. Then, go east to the red glowstick. After reaching the red glowstick, turn north and you’llsee another pink glowstick; head towards it. From there, go east. Next, go northeast andpass through the corridor between the white sea plants.

After the corridor, if you go a bit further northwest, you’ll find a Moon Snail Shell. However, you’ll soon discover that it’s not a Moon Snail Shell, but Petroch, The False Moon.

Another Crab’s Treasure - Shells screen displays all 69 of them

Pre-Fight Preparations

If you have thoroughly explored every area up to this point in the game, your level should be quite high.Being around level 35makes this boss considerably easier.

Reaching this level also means you’ve created a build that suits you. If yourATK or MSG stat is around 20, you’ll have no trouble dealing damage. Defensively, if your combined VIT and RES stats are also around 20, the damage you take won’t affect you much.

Another Crab’s Treasure - Stowaway screen displays Shark Tooth

Collecting every five Bloodstar Limbs will grant you extra HP. If you’ve gathered enough, investing in the RES stat instead of the VIT stat is a good idea.

Best Shells

Similarly, if you’ve reached this point in the game, you must have found a shell that suits your build. Make sure toinsure the shellthat suits your buildthrough Shellfish Desires in New Carcinia. This way, you won’t weaken yourself when you’re not wearing shells that match your build.

Forphysical damage builds, shells likeBaby Shoe, Doll Head, Going Under 64, Boxing Glove, Impostor,orSkullcan be preferred as they provide a five ATK bonus. Formagic damage builds, you can rely on shells likeSkull, Ink Cartridge,andLil’ Bro.

Another Crab’s Treasure - Skills screen displays some skills that Kril has unlocked, The Dispatch skill shown on right side

Additionally, you can also choose shells withhigh defense. Trophy, Dumptruck,andValvewill serve you well in this regard.

Best Stowaways

Best Skills

To make your shell even more effective, Self-Repair and Kintsugi are excellent skills. If you want to enhance your physical effectiveness, don’t forget to unlock Scrap Hammer. Additionally, if your build frequently disrupts your opponent’s balance, unlocking Dispatch is crucial. For magic builds, be sure to unlock Umami Trainings.

Best Adaptations

For an adaptation,Eelectrocute is quite sufficient.Upgrade this adaptation to the third level by talking to Topoda. This will allow you to disrupt the boss’s attacks and safely deal damage while it is stunned.

Find Collectibles To Strengthen Kril

Additionally, don’t forget to collectStainless Relicsto enhance your fork, improve your health withBloodstar Limbs, and increase the maximum number of Heartkelp Pods you’re able to carry withHeartkelp Sprout.

How To Beat Petroch, The False Moon

The most challenging aspect of Petroch isn’t actually its power. If you come to this boss unprepared, it can punish you. The reason for this is that in The Unfathom,you can’t access a Moon Snail Shell until you defeat Petroch.

This means you can’t level up, unlock skills, upgrade adaptations, increase your stowaway capacity, or insure your shell, asyou can’t return to New Carcinia or other areas.Petroch’s attack patterns are as follows:

Another Crab’s Treasure - Adaptation screen displays Eelectrocute

Umami Smash

Medium

Petrochjumps towards youand hits the ground. Acrystal forms at the impact site, which grows after a few seconds and deals damage to you.

Crystal Slam

Petrochjumps towards youand hits the ground,creating crystals in a circular areathat grow after a few seconds and deal damage to you.

Crystal Graveyard

Petrochstands in placeand hits the ground,creating crystals in a circular areathat grow after a few seconds and deal damage to you.

Counter Shield

Short

Petrochhides in its shelland moves towards you. If you deal damage to him during this phase,it won’t take damage and will automatically counterattack, ending this move.

Rollout

Petroch retracts into its shell andquickly rolls towards you, attempting to hit you.

After the Umami Smash attack, make sure to move, as Petroch will create a crystal under your feet that will damage you. The animations forUmami Smash and Crystal Slam are very similar.If he’s using Crystal Slam, you can parry this attack. However, with Umami Smash, a crystal forms under your feet, which cancause damage if you attempt to parry.

Another Crab’s Treasure - Petroch creates a crystal next to Kril

Crystal Slam and Crystal Graveyard attacks create many crystals around the area. Petroch can use these attacks consecutively, filling the area with crystals. To avoid taking damage, try tominimize movement until the crystals disappear.

During Petroch’s Counter Shield, instead of attacking, you can use a Heartkelp Pod if your health is low.As Counter Shield is about to end, you can perform a Charged Attack. Additionally, when Petroch uses Rollout, you canparry to push him away,as this attack will heavily wear down your shield.

Another Crab’s Treasure - Petroch using rollout and tries to destroy Kril’s shell

Finally, using Eelectrocute while Petroch is performing Counter Shield is a good strategy. This will stun Petroch allowing you tosafely deal damage during this period.

Petroch, The False Moon Rewards

Defeating Petroch willearn you 20,000 microplastics.The biggest reward for defeating him isgaining access to the first Moon Snail Shellin The Unfathom. This allows you to level up again, start from this fast travel point, and access other Moon Snail Shells again.

Another Crab’s Treasure - Petroch standing in front of a Moon Snail Shell in The unfathom