Kraven moves several feet away from the group down along the wall to get some distance between his party members (but only if he does not provoke an AoO.) then re-focuses his aim at the sorcerer Varlan is attacking.

Psychic Dagger: Attack: 23 Damage: 9

corpse Psychic Dagger: Attack: 28 Damage: 8

Sneak Attack Damage on 1st hit: 10

Feeling that the sorcerer was the source of the lightning and now that he is closer, in melee range, Kuatho moves to attack.  He uses his spear and a kick to the middle, but then with the use of ki and a flurry of blows, kicks him again and moves his other hand over his chitinous torso, giving himself healing.  (Hand of healing replacing one of the flurry of blows attacks.)

Spear to sorcerer : Attack: 10 Damage: 12 piercing damage.

Kick 1 : Attack: 24 Damage: 10 bludgeoning damage.

Flurry kick 2 : Attack: 16 Damage: 5 bludgeoning damage.

Hand of healing for 4 hit points to Kuatho.

Kraven we are still on the round that you did the healing stuff, I will take the monster's turns and apply this to the next round.

The spear and first kick hit, causeing the caster to move more than you expected causeing the last kick to miss.

3

The casting merrow will grab at Varlan and cast shocking grasp Attack: 6 Damage: 9

Then he will turn his head, change colors to a silver as he casts misty step

The other merrow that attacked last round will attack two at Varlan, 2 at Jecob, 1 at Kuatho.  the other 4 will again hold a turn to move and attack anyone that is trying to leave, which will come up for 1 of them with Kraven.

at Jecob Bite Attack: 9 Damage: 7 Claw Attack: 11 Damage: 11

at Jecod Bite Attack: 7 Damage: 11 Harpoon Attack: 26 Damage: 21

at Varlan Attack: 25 Damage: 7 Claw Attack: 22 Damage: 10

at Varlan Bite Attack: 24 Damage: 7 Harpoon Attack: 13 Damage: 12

at Kuatho Attack: 20 Damage: 9 Harpoon Attack: 21 Damage: 13

When Kraven moves on his turn one of the marrow swims to him and attacks with his harpoon. Attack: 9 Damage: 11

Everyone except Kraven may take thier turns.

(( @DM: A map might help in planning? ))

Jecob will continue bashing the same enemy that he attacked when they got within weapon range (post 3537).

(Game Log rolls)
1st to-hit: 24 Damage: 6 bludgeoning plus 2 radiant
2nd to-hit: 21 Damage: 8 bludgeoning plus 6 radiant

Kuatho easily ducks the attack from the merrow and returns the attack with his spear twice, and a kick.  He will use another point of ki to heal himself again,.  

Spear attack 1 : Attack: 23 Damage: 7 

Spear attack 2 : Attack: 9 Damage: 6 

Bonus action kick : Attack: 8 Damage: 7 

Hand of healing : 8 

((@DM: How does caster look? Medicine 22 (crit) in log ))

Clearly frustrated, Mist doubles down and gives the caster everything he's got (as much or as little as that may be).

Action: Mind sliver - Int save DC 16 or take 8 psychic damage and subtract 1d4 from the next saving throw he makes before the end of my next turn.
Bonus: Tentacle of the Deeps - Attack: 17 Damage: 3 cold + slow etc.

9-3

18, so he saves,  but does take the cold damage, The caster is looking really rough, and might be down soon.

Strenght check, Im making both to save time.

9

17

So yeah he failed that one.

 Varlan I am assuming that you were waiting on that result to take your action, so I will wait till tomorrow to take the monster's next turn.

"Not as easy as you think!" says Varlan in reaction to the casters attempt to evade Mist's mental attack.

Reaction: silvery barbs to force caster to reroll their save against Mind Sliver, and grant Varlan advantage.

(( Sorry to be delaying things, but Varlans action depends on if the caster is still conscious.

Edit: what was the strength check for? ))

(( In the interests on NOT being the cause of delay any longer, I will write two moves! ))

(( Case 1. If the caster is still conscious after re-doing their save vs Mind Sliver ))

Mist (lol) A darkness collects around Varlan, turning the waters to an inky black reminiscent of the defences of an octopus. He disappears from view and moments later appears beside the caster, instantly striking at him. If the blows kill him, then Varlan runs back to the group, ready to attack the weakest of the enemies next round.

"Run now, or face the same fate!" he shouts.

(( Case 2. If the caster is already down ))

Varlan nods in approval to Mist. "Run now, or face the same fate!" he shouts.

The he turns his attention to the weakest of his assailants, striking twice.

(( In both cases, there are two attacks: ))

Attack 1: Attack 24, Damage: 12
Attack 2: Attack 28 (crit!), Damage: 10 (lol)

19 reroll from SB

The Caster finially falls from Varlan's punches.

5 19

The remaining Marrow attack again.

One is next to Kraven, 5 are up front on the main party, and 3 are in the rear, that will hold to move and attack should one of you leave the group.

at Kraven Bite Attack: 12 Damage: 12 Harpoon Attack: 23 Damage: 15

at Jecob Bite Attack: 24 Damage: 7 Harpoon Attack: 25 Damage: 11

at Jecob Bite Attack: 15 Damage: 5 claw Attack: 21 Damage: 9

at Varlan Bite Attack: 9 Damage: 8 Harpoon Attack: 16 Damage: 13

at Varlan Bite Attack: 20 Damage: 6 claw Attack: 17 Damage: 9

at Kuatho Bite Attack: 24 Damage: 11 Harpoon Attack: 26 Damage: 16

It is now the parties turn.

Jecob swings his magic censer.

To hit rolls (from Game Log): 12 , 10
(I'm assuming both miss, and I don't have to roll for damage. That was annoying.)