I'll be more precise in my use of language.

OOC: I'm not sure if Glugrug has any opponent directly adjacent to him or not at this point. If so, he will have disadvantage on the attack. I am just making one attack roll for now. 

As the deep gnome moves behind him, Glugrug begins to hear a mysterious throbbing noise in his head, almost like the beating of a heart, like the beating of the hearts of the hobgoblin soldiers he accidentally burned to death, their heartbeats haunting him...

He manages to get his wits about him and uses one of his artificer's tools to launch a bolt of fire at the closest enemy. The fire makes him a little queasy as thoughts of his past monstrous mistake taunt and haunt him. 

Fire Bolt Attack: 14 Damage: 3 Fire Damage

Jerick grabs his crystal, peeks out from behind Glugrug, and casts chill touch on the nearest monster.

Chill touch Attack: 14 necrotic damage: 2

Aranea moves toward the closest undead, rapier unsheathed. She lashes out at the monster with a slashing attack.

Rapier - Attack 20 / Damage 11

Glugrug blasts one of the creatures with his fire bolt attack. It lets out a demonic scream in pain as it burns to a crisp.

Aranea creeps up to one of the creatures and attack with her rapier. He powerful swing of the rapier beheads the creature. It falls the floor head toppling off its shoulders.

Then Jerick creates a ghostly hand that in manifests just in front of one of the creatures and latches on to it. However, it seems to do little damage to the creature.

(Three creatures left.
Turn order: Jerick, Kysken, Undead, Glugrug and Aranea.)

Assuming it won't put him at risk of an opportunity attack, Glugrug moves to ensure there's some distance between himself and the closest attacker. Then he conjures another blast of fire. 

Fire Bolt Attack: 19 Damage: 3

On her turn, Kysken uses her Shillelagh-activated club on the nearest creature. 

Attack: 10

Damage: 5

Grinning with satisfaction as she beheads the undead monster, Aranea turns to seek out the next closest target. Her blade is ready to taste more blood.

Rapier - Attack 9 / Damage 10

Kysken swings her club and smashes the skull of one of the creatures and it falls down.

The remaining two creatures step closer to the group.

One attacks Kysken with its claws.

(Attack: 22 Damage: 7 slashing damage.)

The second creature attacks Jerick.

(Attack: 6 Damage: 6 slashing damage.)

Glugrugs blasts one of the creatures with another fire bolt attack, but it still stands.

Then Aranea finished off the other creature with her blade.

(One creature left.)

Jerick is looking rough after getting zapped by the book and now slashed by this monster.

Jerick noticed that his necrotic cantrip didn't do much damage to these monsters, so he rotates the crystal in his hand and casts ray of frost at the remaining creature.

Ray of frost | Attack: 19 | Cold damage: 5

Kysken is at -8 HP. 

(-8 HP? How much did you have before hand?)

(Started with 11. 9 damage first time after casting Thorn Whip. 10 points slashing.) 

Kysken Death Saves

8

1

9

Kysken is dead. Have a good campaign.

Glugrug looks on as the half-elven woman falls, hoping that they may be able to revive her if they can quickly defeat their opponents. He quickly fires another magical bolt. 

Attack: 18 Damage: 9

At the first opportunity, Jerick will try to stabilize Kysken.

Medicine 9

Jerick is before Kysken in the play order, so I believe has another attempt before her fateful last death save.

Medicine 14

"You're not dying on my watch, young half-elf."

Glugrug blasts the remaining creature, that was already weakened, and finishes it off.

All is still in the room with the bodies of dead guests now lying on the floor once more.

You have a moment for a breather, but will probably not for long.