Shipwrecked in Saltmarsh

     I believe Fianna would be at disadvantage using Eldritch Blast against the insectoid thing so will instead target the spider...

Eldritch Blast Attack: 14 Damage: 13

((Hex still on insectoid though so no extra damage to spider if hit.))

Weird, no idea why potentially manipulated as I didn't even edit post...  *shrug*

Katernin pushes past Molo and Fianna, her axe held high. She swings at the grappled insectoid:
Handaxe attack: 15  Slashing Damage: 5

 She hits it solidly, cracking part of its outer shell. It squeaks and clicks and thrashes against Molo's steel grip.

((Weirdness...  But I will do a new roll. 

Eldritch Blast Attack: 19 Damage: 10

Though my guess is the first roll was a critical, only was damage got above 13!))

Fianna's beam of crackling energy fries the giant spider with an audible - and rather odiferous - sizzle. It collapses, quite dead. But the insectoid remains, struggling against Molo's grip.

Kelnan and Dain may act next.

Dain steps across to the held insectoid and tries to splatter its brains everywhere!

Power Attack: 6 Damage: 19

The creature twists and scrambles and rolls under Molo's grip, and manages to evade Dain's smashing blow.

Kelnan may act next, followed by Katernin and Molo.

Kelnan aims carefully, trying to catch the insectoid with a Ray of Frost as it twists away from Dain's attack.

Attack: 17 Damage: 2

The creature hisses and spits as it is partially entombed by mystical ice, which partially encases it. It is quickly losing this fight.

But you notice something else - a boiling of little dark forms, appearing out of the shadows to port. Small, but toothy spiders. Dozens, if not hundreds of them, in a tight swarm.
Spider swarm - Initiative: 10

 Before anyone can act, they crawl up Dain's legs - some under his shirt - and attempt to sink their tiny-but-sharp fangs into exposed dwarven flesh.
Bite Attack: 14  Piercing damage: 9

Katernin and Molo may act next.

Updated Initiative (in order, although, as always, I will sometimes resolve turns in posting order):
Spider Swarm: 21
Katernin: 16
Molo: 15
Insectoid: 15
Fianna: 14
Giant Spider: 12
Kelnan: 9
Dain: 5

Molo slashes at the prone insectoid in his grip

Attack: 6 Damage: 2 

Dain tries not to scream out in pain as he gets swarmed by tiny spiders.

OOC:  applied the damage.

Molo fails to get his knife into the squirming insectoid, while Dain dances with spiders in his pants.

Katernin may act, followed by Fianna.

Katernin swings her axe again.

Attack: 7 Damage: 7

Katernin swings her axe at the grappled, prone insectoid struggling to escape from Molo's grip. (Advantage roll: 19)

 She strikes it square in its plated skull, and for a moment you think it's dead.

But then, in a frantic struggle to escape, it twists in a desperate act to break free.
Dex check to break grapple: 10

Molo should make a contesting strength check to keep it grappled.

Then, Fianna, Kelnan, and Dain may act.

Molo 20 

Molo easily keeps the wounded bipedal insect from escaping. 

Fianna, Kelnan, and Dain may act next.

Dain is going to focus on the prone insectoid thing.

Power Attack: 16 Damage: 23

If that attack killed the insectoid he will use his bonus action to swipe powerfully at the swarm, fighting recklessly:

Attack: 10 Damage: 19

This leaves him granting Advantage to opponents until his next turn.

Dain crushes the bug. It lay squashed on the decking, quite dead.

The swarm of insects, however, he finds difficult to attack. (Is that roll really sans bonus?)

Fianna and Kelnan may act next. The swarm of tiny, aggressive spiders continues to crawl all over Dain.

     I believe technically Fianna is first, so insecticide still alive… (so Fianna cannot transfer her Hex) Fianba Will just send a crackling beam of energy at the Spider again and back away from the swarm, but staying in sight to throw more blasts in the future…

Eldritch Blast Attack: 20 Damage: 6

Kelnan

Stifling a giggle at the squirming dwarf, Kelnan tries to freeze a few off with a Ray of Frost

Attack: 7 Damage: 1