Shipwrecked in Saltmarsh

Molo steps through the threshold into the next, web-filled cabin, and is caught by a freshly-spun web. A trap. He is restrained. 
The party is surprised by two humanoid-sized spiders covered in coarse, wiry, black, hair that were perched on either side of the doorway. 

Spider #1 Bite Attack: 22  Piercing damage: 2, and on a hit Molo must make a DC 11 Constitution saving throw, taking 7 poison damage on a failed save, or half as much damage on a success.

Spider #2 Bite Attack: 22  Piercing damage: 5, and on a hit Molo must make a similar DC 11 Con save, taking 12 poison damage on a fail, or half on a success.

Meanwhile, another spider-humanoid, similar to the one you fought upstairs, joins the fray.

Initiative:
Hairy Spiders: 19
Insectoid: 4
Fianna: 9
Katernin: 11
Kelnan: 17
Molo: 16
Dain: 11

Molo should roll that CON save.
Fianna is up next. (There's not a lot of room to melee, but you can move through a friend's space with only difficult terrain penalty. There's just room to stand and fight in the two empty spots beside Molo. Right now, those on the stairs can only see the starboard spider.

     Fianna instinctively moves her Hex onto Spider #1 and cuts loose with an Eldritch Blast at the same target, shouting "Lay off my friend, freaks!"  She knows they're spiders and likely have no language... But ewwww, more spiders!

Eldritch Blast Attack: 18 Damage: 7 plus 4 Necrotic if it hits...

Molo con save -1 

Molo is alive, but not by much...

Fianna nearly kills the hairy spider to starboard (#1), but it lives yet, if badly wounded. (What ability does the hex affect?)

Molo is in bad shape, restrained in the web, and at the mercy of the spiders. (As an action, on his turn, Molo can make a DC 12 Strength check, bursting the webbing on a success. Alternately, somebody can hack at the web as an attack. Until then, Molo attacks at disadvantage, and attacks on him are at advantage.)

Initiative (in order):
Fianna: 21
Kelnan: 18
Hairy Spiders: 15
Dain: 11
Katernin: 8
Insectoid: 8
Molo: 4

Kelnan is up next!

(Still Strength, don’t think I can change after casting…)

Kelnan

"Molo? You alright down there?" He points and fires an icy Ray of Frost at the visible spider.

Attack: 7 Damage: 6

Kelnan fires his blue ray past the spider and deep into the obscured webs behind.

The injured spider retreats into the gloom and attempts to disappear into the thick webs. (Stealth: 13 )

The other, having caught fresh prey, digs in:
Spider #2 Bite Attack: 21  Piercing damage: 4 , and on a hit Molo must make another DC 11 Constitution saving throw, taking 9 poison damage on a failed save, or half as much damage on a success.

Molo loses consciousness. (He is stable but poisoned for 1 hour, even if he regains hit points, and is paralyzed while poisoned in this way.)

Dain and Katernin may act next. (Assuming Blakey has also disappeared into the thick webs, can somebody suggest a relatively safe option for him?)

Katernin starts hacking at the webbing to pull Molo out of the Spider's attack path, pulling him out and away. She places her hand near the wound and clears the poisen from his body.

Casting Lesser Restoration

((So Molo not having to make Death Saving Throws?

And Dain could grappling hook Molo away from the melee, use his antitoxin and potion of healing, and get the little one back on his feet…))

((oops, she snuck in and took care of it already!  So Dain can just get confused, think he’s a bard, and try to inspire us with an interpretive dance…))

((Lol sorry XD))

((Nono, it’s a better solution than making a grappling hook attack and then dragging him out!))

(No death saving throws in this case.)

Katernin touches Molo and clears his unconscious body of poisons. (Hacking at the thick, sticky, tough webbing must be its own action.)

Dain pushes past FIanna and Katernin and swings his maul at the webs:
Maul attack vs. webs:  25  Damage: 10

 He clears them with a single, powerful swing, and then pulls Molo behind him.

The insectoid steps into the doorway and assaults Dain:
Bite Attack vs. Dain: 21 Piercing damage: 10 plus 5 poison damage. 
Claws Attack vs. Dain: 48  Slashing damage: 8

 Dain takes a nasty bite to the shoulder. DC 11 Constitution saving throw or be poisoned: 23 
Fortunately, Dain doesn't poison easily.

Fianna and Kelnan are up next. (Molo is still unconscious at 0 hp, although he is stable and no longer poisoned.)

     Fianna slips over to get close to Molo and quickly kneels down and casts Cure Wounds upon him for 9 worth of healing into his little kobold form...

Molo comes to. Kelnan may act next. He can see the bipedal insect from where he stands, but not the hairy spider.
(Nature checks: 13, 7 - he tries to recall anything about these species, but comes up short.)

Kelnan takes aim at the insect and launches another fiery Chromatic Orb, hoping to clear some webbing in the process.

Attack: 8 Damage: 18

Kelnan launches a sphere of fiery energy, but it misses the insectoid and instead just burns through some of the webbing, leaving a melted, stinking hole in the sheets of webs. He can make out a large wooden grate on the floor behind the insectoid, evidently leading down into the hold or a lower deck somewhere.

The hairy spider launches itself at Dain:
Bite Attack: 6 Piercing damage: 6 (and on a hit, Dain must make a DC 11 CON save, taking 4 poison damage on a failed save, or half on a success.)

The other, wounded, hairy spider has retreated into the webs, but Kelnan and Katernin can see where it's hiding; the rest of you cannot spot it.

Dain holds off his attacker - barely - and swings his powerful maul at the hairy beast:
Maul attack: 13. Bludgeoning Damage: 11

 But he misses the dextrous arachnid.

Katernin is up next!

The party is jammed into a dark, dirty little hallway and stairwell, belowdecks on a tilted ship. 

Dain is under direct attack by a bipedal insectoid, and a four-foot-tall hairy spider. (Kelnan and Katernin can see the second, wounded spider, hiding in the webs behind.)

Molo, just waking up from his poisoned nap, steps on something with a crunch. Looking down he sees what looks like a silver bracelet, laying in the debris on the floor in the corner.

Katernin may act next.

The insectoid savages Dain. 

Bite Attack vs. Dain: 14 Piercing damage: 9 plus 8 poison damage (and on a hit he must succeed on a DC 11 CON save or be poisoned for 1 minute.)

Claws Attack vs. Dain: 15 Slashing damage: 8

Con Save: 23

 Dain evades the poison, but the claws take him down. He lies unconscious, in a pool of blood, on the deck. (Blakey! Help!)

Katernin and Molo may act next.

"Oh no you don't," Katernin says as she swings her axe at the insectoid.

Action: Handaxe Attack
Attack: 18 Damage: 3

Bonus Action: Healing Word on Dain (1st Level)
9

Molo gets way up in Dain’s business and just kinda’ teeths one of his wounds, healing it with his incredible dragon powers. cure wounds 8 before slapping him on the butt. “Get back In there champ!” For a bit of inspiration (a d6 to attack, AC, damage, ability check or saving throw)