Not very good klaxons. Not that it matters, because they're quickly transformed back into cloudfluff.

The new angel finds themself near a couple of other angels playing chess plus a third one watching.

"What the fuck," one of the players asks in a language not spoken on Earth.

Words in English appear on the surface of the cocoon in a disorderly jumble, many blurry or partially merged with others: "Help". "Pain", "New", "Empiricism", "Klaxon", "Move", "see", "Guide", "Help"...

Well that's alarming. None of the angels there speaks English natively, but the third one takes summons so she can.

"Can you hear me?" she asks in English, approaching the—coffin? "You shouldn't be in pain, did you do anything—"

The words "Muffled" and "Volume (sound)" appear, then a tube presumably for the purpose of conducing sound opens in one side. A moment later, the cocoon except for text turns a slightly cloudy transparent, revealing the new angel floating now in a sort-of upright position, the hand in front of it a gelatin-suspended coral-like mess of exposed nerves, bone shards, tree-like veins, and half-formed tentacles.

One of the angels says something in that weird language that sounds like heavy cursing.

"Stop changing your body!" the English speaker says, and grabs some cloudfuff to also write out these words. "Just let it heal."

"NO IT SUCKS is BAD :(" scrawls itself in an angry red which immediately after forming stars dissolving as the syrupy substance the dye appeared within shifts as a only mostly laminar flow. 

"I can teach you to change it later, safely, without doing that, I do it all the time!"

"nO  i almo st gOT THis why Wait ? 's just a hAND ... now now NOW ick goNE???"

"Because—" And her body starts changing, she has had a few decades (more like over a century) to practice this, and...

"—I know what I'm doing and you don't."

That only seems to encourage them, and suddenly all at once their skin and large chunks of flesh melts away into syrup like burnt plastic, followed by layers below swelling up resulting in something that looks like a teleportation accident between an autopsy and a badly melted realdoll made from ballistic gel.

"oW BUrns!"

"Stop—doing—that! I can change you if you let me."

(The other two angels surreptitiously take their game and fly off.)

Much neater text appears saying thus: "Oh. Yes please! Shoggot? Just whatever is as far from this you can do easily so I have somewhere to live while learning? Something that's easy to customize?"

"Okay, yes, just let yourself heal."

She turns herself back into a female and starts turning the stuff inside the new angel's—coffin thing—into air.

The mentioned angel rapidly replaces the anesthetic-doped neutral-buoyancy saline to try to avoid the extreme pain touching air right now would be while trying to in between add text to it explaining such.

"Let yourself heal it'll be fast I swear, you're indestructible and immortal, just. Relax."

More text:

"Being immersed in water will prevent that?"

"No, it won't, you don't actually need to breathe to survive, just don't change anything and your mind should do the rest, but there's no need for you to be in the water."

After about two minutes of just trying to relax in the creepily organic shaped bathtub the thing is nominally human, although minimally so with thin skin and no hair.

"...wow you look terrible I get why you want to change, d'you have anything in mind you want to look like or?"

"Just whatever is the most different from this as possible. Maybe something feminine with lots of tentacles and easy customization?"

"...I don't actually know how to make you functional nonhuman parts—other than wings, I can do the wings—but I could do female. Just—I might need to cut you open for that, to, like, be able to look at internals and stuff, I don't know your body as well as I know mine, I've had centuries..."

"Sure that works"

"Okay, but I'm not gonna do that right here out in the open, I'm gonna take you to my place, yeah?"

"Nah I want to get rid of this right away, lets set up a tent."