Ambling Pearl (O-02-21-11) is a WAW-class Abnormality encountered during Canto V. It was previously contained in the L Corp. branch in U Corp. before the whole facility was swallowed by the Pallid Whale.
Ambling Pearl is a giant clam with a dull olive colored shell supported by a set of insect-like legs. It has four long, black legs that end in three-clawed feet. It has a pair of shorter arm-like appendages protruding from within the clam's shell. All of its limbs have a metallic appearance, with multiple joints visible.
With the shell ajar, numerous small eyes can be seen lining the inner edges of the shell's valves. A green frothy muck is present inside the clam, surrounding a single pearl. The green slime produced by the Abnormality is poisonous in nature, and also contains its larvae. As the Abnormality moves, slime constantly spills from its shell.
Ambling Pearl's shell is extremely durable, leaving it resilient to all forms of attack. If enough slime is removed, the shell can be fully opened, exposing the pearl as the Abnormality's weak spot.
Story
Log Writer: Sinclair
Um… So, that green clam, right?
It reminded me a lot of one of those Trash Crabs. Like the green slime, the ocean smell… you know.
It looked and acted like… a clam. I think. It had these shells that were shut tight.
… Though the Clams I’ve seen before didn’t have arms or legs like this one.
And… they weren't as big as this one.
We decided to wait and see for a bit before attacking, and… its shells would open up.
And in there was some… gurgling, bubbling green liquid that was spilling out of it, and… oh.
Yeah… There were some weird… larva-like things in there, and…
(There is a mark on the page. Something wet dripped here and dried.)
→ Huh? What’s this here? Where’d the lad go without finishing the log? (Heathcliff)
→ If by ‘lad’ you refer to Sinclair, I witnessed him leaving hurriedly to the deck. I could tell from his pale countenance that he was, like myself, suffering from seasickness… (Yi Sang)
→ A closer observation of the residue reveals that it is perspiration, not vomit. Do not worry; this will not have a negative effect on the cleanliness of the records. (Faust)
→ Fau… I didn’t need to hear that either… (Rodion)
Its shell… was too durable.
We could strike at it for ages and it won’t break. It’s like our attacks were doing nothing…
Oh, uh… I did try something, though.
Since my halberd’s pretty long, I thought that maybe I could wedge it between the clam’s shells and try to twist it open by pressing it down…
I learned it in school, uh… what was it again? Like a counterweight on a lever…
Well… it didn’t work, though. All it managed to do was to break my halberd in half.
But I think I learned something from that experiment.
When the thing’s shells are shut, green slime seems to gather around it, making sure that the shells would stay shut.
So while I couldn’t open it… I was able to tear some of the slime off, at least.
Maybe getting rid of those slimes first could help us open it up and attack its softer parts?
→ Hmph, why did you not record the part where you flailed wildly with the broken pieces of your halberd, soldier? (Outis)
→ H-how is that relevant?! (Sinclair)
→ That is pertinent information. Despite your ineffectual attempts at drawing their attention, the larvae from the entity’s effluvia instead opted to attack allies that were in a better state than you were. (Meursault)
→ This was a meaningful discovery. However, your meaningless struggle with an ineffective weapon could have been a part of this record as well. (Faust)
→ … Meursault… Faust… come on… (Sinclair)
There was a pearl inside the Clam.
… I don’t even know if it’s right to call it a pearl. All I saw was that odd, twinkling light inside the bubbling toxin.
But I’m sure that twinkling light… is this Abnormality’s core.
… It’s just a shame that we had to suffer so much before getting the chance to attack its pearl.
I-I guess I’m starting to understand… now. Or maybe I’ve just grown used to it.
We’ve always had to sacrifice ourselves to solve anything, after all…
→ Glad you’re learning something new, kiddo… but how about this? Say… like, not just standing around in an emergency? (Gregor)
→ No need to coddle him about it. Oi, we all died because you were busy celebrating, goin’ “I-I did it!” after getting the clam’s gob open. (Heathcliff)
→ … Sorry… (Sinclair)
Mirror Dungeon Event
Mirror Dungeon Event
The barren mudflat reeks of salt and rot. What little jade-colored seawater is left there doesn’t seem to have anything inside.
A giant clam walks before you. With each step it takes, it sprays a fetid green muck.
Is the clam the source of the contamination, or is it working to contain the filth?
Sample the green substance. Gluttony & Gloom Advantage check. Pass to gain a Pierce E.G.O Gift.
Who should do it?
Gluttony / Gloom Advantage: ≥ 9 No Advantage: ≥ 18
Check Passed
You contain some of the slime in a glass jar.
This isn’t simply a mass of filth.
Numerous hatchlings swim inside.
These tiny creatures are feeding on each other; could they be the clam’s offspring?
E.G.O Gift Sticky Muck Earned!
Check Failed
You approach with a glass jar in hand.
However, hesitation takes hold, and you eventually turn around.
You couldn’t stand the thought of reaching out to contain that filth.
In fact, you get the feeling that it’s something you mustn’t hold.
The sinner who failed the check takes 10 SP damage!
Approach it.
You wade through the virescence.
With each step, the foul mud brings terrible pain to one’s feet.
You can no longer move forward.
Besides struggling to wade through, you worry that your legs might slough off if you go farther.
While you were hesitating, the clam walked off into the distance.
Speed -2 at the start of the combat phase.
Throw the green substance at it. Win the battle to earn a Pierce E.G.O Gift and a Tremor E.G.O Gift
You gather the green substance into a glass bottle... ... and chuck it into the giant clam's maw. Perhaps you caught it off guard by throwing a bottle full of filth into its mouth. The clam spits out the bottle and begins crashing through the filth in your direction.
Win the battle to gain E.G.O Gifts "Sticky Muck" & "Bio-venom Vial"
Gift
Tier: I Cost: 156 Pierce
Sticky Muck
When hitting an enemy with a Pierce Skill or a Gluttony Affinity Skill, inflict 2 Defense Level Down Defense Level Down Defense Level -X for this turn..
Tier: III Cost: 259 Tremor Tremor When hit by attacks that trigger Tremor Burst, raise the Stagger Threshold by X. Lasts Y turn(s).
Bio-venom Vial
If a target with Tremor Tremor When hit by attacks that trigger Tremor Burst, raise the Stagger Threshold by X. Lasts Y turn(s). Potency is defeated, inflict 0.5(Tremor Tremor When hit by attacks that trigger Tremor Burst, raise the Stagger Threshold by X. Lasts Y turn(s). Potency + Count on target) Sloth damage to a random enemy(or a random Abnormality part) next turn
E.G.O
The Effervescent Corrosion E.G.O is extracted from Ambling Pearl.
Hong Lu and Rodion's E.G.O were added in the Season 3 Battle Pass and are obtainable through the Dispenser from Season 4 onward.
The Abnormality environment for Ambling Pearl bears a striking resemblance to the polluted mudflats which serve as the setting for Intervallo II.
The numerous eyes lining the inner edges of its shell resemble the eyes of a scallop. Scallops have up to 200 simple eyes in a similar location, which they use for detecting changes in light and motion.
Gluttony / 
Gloom Advantage: 
Pierce
