Shipwrecked in Saltmarsh

Kelnan hangs back, peering down through the grate in case dark vision reveals anything hidden within.

Fianna throws a piece of debris (there's plenty to be found.) It cuts easily through the webs - these sheets of webs are evidently not made of the same sturdy stuff that sealed the door shut - and clatters somewhere near the bow, out of sight. Immediately there is a sudden flurry of noisy movement - the sound of a big animal of some sort - and then silence. Whatever it was, it was too obscure to see beyond a slight movement of distant shadow. All is perfectly silent again, other than the roar of the ocean and the creaking of the ship's weatherbeaten timbers.

Meanwhile, Kelnan peers into the grate. He can see a ladder extending down into a hold or cabin below, but the grate is rusted shut. It can be wrenched open with a successful Athletics check or smashed apart. He can't see clearly enough through the grate to see anything substantial below.

     "I could send Fi'Finella in there invisible...  But I don't want to lose her to some hungry something or other, if I don't have to," Fianna says.  "Anyone able to shed some light around in there without burning the ship down?"

Molo marches in after the webs. “Come on out, kitty. Let’s see what you are.” He’s ready to try to grab anything that moves. Sword is sheathed and shield is up.

Dain is moving in alongside Molo, maul ready.

That's when the creatures appear out of the webs on the ceiling– a massive, bloated spider, and a strange, pincered, insect-like humanoid. Their surprise spoiled by Fianna's trick, they lunge to attack the party from above.

Initiative:
Fianna: 17
Katernin: 16
Kelnan: 17
Molo: 11
Dain: 8
Giant Spider: 23
Insectoid: 3

 Katernin, outside the door, is the first to react to the ambush attempt. Molo may also act.

Molo tries to grab the humanoid and hang onto it.

athletics 15 

Molo attempts to grapple the insectoid, although he soon discovers that this odd bipedal creature is both strong and fast. It tries to hold off the little kobold with brute strength. Contesting Strength check: 4

 But it grossly underestimates Molo's strength, and is quickly subdued. It is grappled.

Katernin is up next.

The bipedal insectoid struggles and snaps at Molo:

Bite Attack: 5  Piercing damage: 6 plus 6 poison damage (and Molo must succeed on a DC 11 Constitution saving throw or be poisoned for 1 minute).

Claw Attack: 7  Slashing damage: 4

But it fails to injure Molo or break his grip.

Katernin and Fianna may act next.

Katernin brings down radiant flames on the creature.

Sacred Flame: DC 14 dex save or take 8 radiant damage.

The dextrous insectoid squirms and lurches in Molo's grip to avoid Katernin's holy flames. Dex Save: 5

 But it cannot run, and is seared by her radiance. 

Fianna may act next.

     Fianna will drop her Hex on the creature everyone is focusing on and then send an Eldritch Blast it’s way. The Hex gives it disadvantage on Strength ability checks…

Attack: 21 Damage: 13 plus 1 necrotic from Hex…

Fianna curses the hostile insectoid and blasts it with a beam of purple crackling energy. It's not down yet, though - the subdued bug-thing still has plenty of fight left in it.

Meanwhile, the massive spider, clinging upside-down on the ceiling, lunges for Dain:
Bite Attack: 12  Piercing damage: 4, and Dain must make a DC 11 Constitution saving throw, taking 11 poison damage on a failed save, or half as much damage on a successful one.

 But it fails to injure the sturdy dwarf.

Kelnan and Dain may act next, followed by Katernin and Molo.

Dain swings mightily at the spider!

Action:  Recklessly Power Attack: 22 Damage: 22

OOC Note: Giving advantage to all who attack him till next round.  Not raging (yet)

Dain badly injures the fat spider with a single blow of his maul. It's seriously hurt.

Kelnan may act next; Katernin and Molo may also act.

Molo maintains his grapple and attempts to trip the insectoid

athletics 16 

Kelnan struggles to get a clear line of sight between the darkness and crowded doorway, and lobs a ball of acid at the enemies.

Acid Splash DC 14 Dex save to avoid 5 acid damage

(Both if they're next to each other, otherwise the insectoid)

Kelnan squeezes next to Katernin and flings a bubble of acid between Fianna and Molo and toward the insectoid (the big spider is a little too far away.) The insectoid squirms in Molo's grip to avoid the acid.

Dex save: 7

 It fails, and receives a minor burn from Kelnan's magical acid.

Meanwhile, Molo maintains his grapple on the grotesque creature, and tries to shove it to the ground. Contesting strength check (with disadvantage due to Fianna's hex): 8

 ...And down it goes, again underestimating Molo's strength. It is now grappled and prone.

Katernin may act next.

Initiative (in order, although, as always, I will sometimes resolve turns in posting order):
Katernin: 16
Molo: 15
Insectoid: 15
Fianna: 14
Giant Spider: 12
Kelnan: 9
Dain: 5

The insectoid, thrashing and hissing and spitting, shoots a sticky stream of webbing at its kobold captor.
Ranged Web Attack: (at disadvantage due to range and being prone) 8 

Molo dodges the worst of the gooey web.

Katernin and Fianna may act next!