Stena and FOG are both squeezed by the ones on them, while the one Neth had stabbed departed. None seem to bother Lia, but Galingal has one flapping about him seeking to latch on.

Lia: 20  (-10 HP) 
Neth: 19  (-12 HP, BLIND)  
Jimjar: 17 (-17, BLIND, CANNOT BREATHE)  
Darkmantles: 15 (---/---/---/---/Xd/Xd/Xd/-10d/-5d/Xd/Xd)
Galingal: 13 (-8 HP, BLIND)
Ranador: 13  (BLIND)
Buppy: 9 (-23 HP, BLIND, CANNOT BREATHE)  
Stena: 7  (-14 HP, BLIND, CANNOT BREATHE)  
Plibble:  7 (-11 HP, BLIND, CANNOT BREATHE) 
F.O.G: 4 (-9 HP, BLIND, CANNOT BREATHE)  

Gal gets re-engulfed, and Stena gets squeezed, but perhaps Lia helping FOG kept him from getting squeezed too hard.

Lia: 20  (-10 HP) 
Neth: 19  (-12 HP, BLIND)  
Jimjar: 17 (-17, BLIND, CANNOT BREATHE)  
Darkmantles: 15 (---/---/---/---/Xd/Xd/Xd/-10d/-5d/Xd/Xd)
Galingal: 13 (-18 HP, BLIND, CANNOT BREATHE)
Ranador: 13  (BLIND)
Buppy: 9 (-23 HP, BLIND, CANNOT BREATHE)  
Stena: 7  (-20 HP, BLIND, CANNOT BREATHE)  
Plibble:  7 (-11 HP, BLIND, CANNOT BREATHE) 
F.O.G: 4 (-9 HP, BLIND, CANNOT BREATHE)  

((Is Lia still hidden by the general clustered darknesses?))

FOG, with Lia's help, tears his off his head, and is able to draw a full breath without the thing caressing his face, but it's still pitch black, and the creature writhes in his hands.

Lia: 20  (-10 HP) 
Neth: 19  (-12 HP, BLIND)  
Jimjar: 17 (-17, BLIND, CANNOT BREATHE)  
Darkmantles: 15 (---/---/---/---/Xd/Xd/Xd/-10d/-5d/Xd/Xd)
Galingal: 13 (-18 HP, BLIND, CANNOT BREATHE)
Ranador: 13  (BLIND)
Buppy: 9 (-23 HP, BLIND, CANNOT BREATHE)  
Stena: 7  (-20 HP, BLIND, CANNOT BREATHE)  
Plibble:  7 (-11 HP, BLIND, CANNOT BREATHE) 
F.O.G: 4 (-9 HP, BLIND, holding one)  

((Lia is not able to see, but feels like the creatures may have a minor aversion to her.))

FOG breathes heavily for a moment, then quickly calls out.

"Got a live one here!"

His next action would depend on how aware he is of what his surroundings were like in the dark. If he's quite sure he's got a clear shot to the edge of the boat, he's just... Going to try and throw it overboard. Failing that, however, his actions are mostly instinctual. Throwing it on the ground, trying to keep it pinned so it can't wrap over his head again, and stab it with his knife.

Attack: 15 Damage: 6

(Let me know if I should roll something else)

((You're getting ahead of things here FOG, getting it off was your turn for this round! I'll put this in the queue for next round though! Your attack will be at disadvantage though, unless you get advantage from some other source.))

(Yeah sorry, the intent was that being for next round of course! And you're right about the disadvantage, so:)

16

((You can still yell this round, just in case you can't 6 seconds from now.... 😉))

((Then he does the yelling this turn. :P ))

Galingal has only a moment to take a breath through the inky guts of the creature he killed before another wraps itself around him and nearly crushes the life out of his lungs.

Instead of trying to pull the creature off enough to say anything, he stabs up into what he can feel as the leathery underside of the darkmantle; once then twice with his rapeir.

Action: Attack: 8 Damage: 6  

Bonus Action: War Priest Extra Attack - 20 Damage: 8   

Stena pushes again the leathery, moist doom, terror fully setting in now.

Strength: 10

Bardic, a desperate bardic: 1

Galingal isn't able to get the angle with his rapier, and Stena struggles and fails to get the darkmantle off of her head. 

A voice calls out from the side in Undercommon, maybe twenty to thirty feet from the boat, for those of you with your heads covered, it's muffled, but recognizable as Plibbleburp.

 Lia: 20  (-10 HP) 
Neth: 19  (-12 HP, BLIND)  
Jimjar: 17 (-17, BLIND, CANNOT BREATHE)  
Darkmantles: 15 (---/---/---/---/Xd/Xd/Xd/-10d/-5d/Xd/Xd)
Galingal: 13 (-18 HP, BLIND, CANNOT BREATHE)
Ranador: 13  (BLIND)
Buppy: 9 (-23 HP, BLIND, CANNOT BREATHE)  
Stena: 7  (-20 HP, BLIND, CANNOT BREATHE)  
Plibble:  7 (-11 HP, BLIND, CANNOT BREATHE) 
F.O.G: 4 (-9 HP, BLIND, holding one)  

If the person she’s helping got free, then Lia will cast about in the dark and help the next person she finds with a creature on their head (otherwise she stays where she is and offers help to the same person)…

((help action: @Spider will need to say who Lia bumps into and helps here next!))

 ((Yes, Lia was able to help FOG get loose, and can feel it flapping and grasping at their arms. 4))

 ((Lia backs into Stena, and would be able to give her help on getting it off if she's leaving FOG to deal with his removed one.))

((Yep, right now Lia is only interested in getting people’s heads free! She moves on to help Stena. I think the help action can help either a check or an attack? Stena’s choice?))

((Sure, if you're tugging at it, that could either help by providing a bit more force to help get it off, or to help hold it still for an attack of some sort.))

((Can Neth hear if anyone is nearby him and tell abouts where they are?))