Stena looks down at the face of the child just recognizing the Drow features. Her expression waivers before hardening and asking Shuushar mentally,

<Can we get her to cover and hide her from her owners? At this Ploop's temple? I, we, saved a person not property.>

She ignore the slimy fight happening behind her and will help carry her away if needed or find something to cover her with.

Thom's first arrow goes wide, vanishing into a ramshackle building behind the creature, the second passes through it. While Derendil's attacks were literally 'splashy', the creature reformed without seeming to be too hindered by them. Your arrows are passing right through it, which looks impressive, but you figure if they aren't being slowed too much, they probably aren't imparting much damage on their way through.

Sarith will make an effort to pull the drow child into an alley, out of the way of the ruckus, helping to shield them from the Sloobludop citizens that are still running about in the chaos.

Ploopp calls out in a booming voice in Undercommon as a shimmering surrounds Derendil.

 Those of you that don't speak the language may recognize Derendil's name and the gurgling syllabus by which Ploopp refers to his goddess.

Elemental WIS Save: 10 vs DC 14, or 9, half on save

The circling spectral fish continue to circle the creature, boring holes through it, as the elemental lashes out towards Derendil.

Constrict Attack: 16 Damage: 8

Shuushar looks around in concern before replying, <We can, but I don't know if Ploopploopeen will agree to shelter them... quick!>

 ((Stena, you can make a check with Advantage from Sarith and Shuushar's help, I could see a case to be made for Stealth or a CHA skill like Performance or Deception, your pick. It will be opposed by their master's Perception check... 22))

The elemental snags Derendil despite Ploopp's bolstering spell, the water closing around the quaggoth's snout as more water flows down the extension, bolstering it and dragging him closer to the fountain.

<This is a small favor compared to what he is asking Shuushar. Help him understand, I know you're good at that.>

Stena will glance around before moving forward to scoop the girl up from Sarith and slip into the ramshackle mess of buildings beyond.

Stealth: 11

 ((Forgot the advantage but that'll do, ya?))

((Yup! The KT that got bashed into the crates along with the drow child is a bit slow getting up and about, and though he looks around the square, the three S's and the kid are already down an alley. You staying put, or having Shuushar lead you somewhere? You'd asked about the Sea Mother shrine/temple, he'd know the way there.))

<Shuushar, get us to Ploop's temple.>

Shuushar nods, and looks around for an opportunity to scurry away into the city.

Galingal eyes Derendril caught up by the elemental. That would deal with two problems at once he thinks to himself, keeps the elemental occupied while we leave and deals with what is going to be a problem soon enough. But he then catches sight of Thom and Lia. Those two are unlikely to sacrifice the quaggoth. 

He then notices Stena and Sarith grabbing the child and whisking it away. Galingal moves to provide cover between Stena and Sarith and prying eyes.

With no other options, Galingal again motions his hand towards the elemental and again says "maksaa kuolleita."

Casts Toll the Dead  DC 14 or 1  necrotic damage.

 (Wisdom Save DC 14)

WIS Save: 7 (7)

The creature once again shudders as Galingal vibrates it with with a harbinger of its death.

Buppido is gone, Lex is still struggling to keep Stool from trying to be a hero, <Awww, let me at 'em! We'll show it who it's messing with!>

Jimjar curses and fires off another bolt.

Attack: 17 Damage: 11

This bolt seems to strike harder, and the bolt floats within its body, alongside the dead kuo-toa it snatched from the crowd.

Lia keeps trying to shuffle to the back within Ploopp’s school of followers.

She sees Derendril get all embroiled within the slimy tendrils of the thing and she shouts over, “Oh no!… Eww!!… …Do you know how long it’ll take to ‘prestidigitate’ that out of quaggoth fur?!!…”.

Cast a spell action (vicious mockery): WIS save DC13 or take 2 (psychic damage) and have disadvantage on next attack.

Then she calls over to Derendil, “Don’t worry… it’s… umm… good for your hair(?)…”. 

((Bardic inspiration to Derendil. (1d6) )).

WIS Save: 9 (20)

Was that... burbling laughter?

Derendil struggles and thrashes within the creature.

Attack: 22 Damage: 5
Attack: 11 Damage: 4

Even restrained the quaggoth/elf manages to gouge his foe, water spilling the engulfing arm of water.

Thom notices Stena and Shuushar really fussing with the child now. wait, are they falling back!? well shite. Whos kid is it anyway?  he thinks to himself as he follows Lia over in the general direction so he doesn't loose sight of any of them, but he isn't full on leaving the prince. Not yet anyway. 

Thom seeing the prince being taken in by the water creature, he mutters crap and then yells out, hoping that no one heard him order the prince into melee with this thing in the first place "EVERYONE! IT'S GOT THE PRINCE! .....somehow!" (he says the somehow part quieter. lol)

Ok, given what Thom has seen and also seeing Jimjar continue to fire upon the strange watery creature, Thom shrugs his shoulders and continues to fire upon it. He yells out to Jimjar "Gotta be doing something then, yeah??" (Thom has no idea.) 

He yells out to the prince as he sees him impressively still trying to fight "YES MY PRINCE! KEEP FIGHTING! KEEP BREATHING! DON'T GIVE UP!"

Longbow: 10 Damage: 6

Thom catches a glimpse of one or more of the S's taking off into an ally. ((Think might need a Perception check to see if he spots them departing with the slave child, Stena rolled high on her stealth (23).))

Jimjar nods, "Two gold says we put it down before the Prince rips his way free?"

His shot goes wide as Derendil gives him a puff-cheek look of confusion when he hears the warbling instruction to keep breathing while his head is surrounded by liquid.

Stena, the child, having been smashed into the crates, then subsequently extricated frisked by the three of you, only to be grabbed and run off with, is starting to struggle and squirm, trying to break free from their 'captor'.

Acrobatics Check: 15

Thom's perception if you'll allow it as an action on that turn to see if he spots more details about the S's departing, and where 18

((Thom can make it in addition to his attempt at a shot, he catches a glimpse of Sarith and Shuushar entering an alley, but missed the bit with Stena and the kid. He certainly could have noticed her head in that direction, though he doesn't see Commander Stena on the field of battle. So could possibly surmise she's with them. Buppido is also not visible, and it would be even more unlikely that she'd have gone with him.))

In undercommon Stena will say as soothingly as she can,

"We're getting ye to safety girl. Calm down...calm down. We're going someplace safe. Tell her it is okay Sarith."

While she is explaining what is happening she will work to keep the girl under control.

Acrobatics/athletics (same mod): 23

"Fork you, you dwarfy whisk! I'm not a girl! I'm a spooning boy!" 

The drow child wriggles free, kicking and scrabbling.

"You're a slave here? We don't mean to hurt you! Stena here saw an opportunity to help!"

Sarith Persuasion: 14

The kid scrabbles on the wet ground, before stumbling to their feet and starting to run away.