Round 3 (con't):
Hobgoblin Assassin The hobgoblin and duergar heard the fight and have come to see what is happening! The hobgoblin assassin makes a surprise attack against Magrea with his light crossbow - Attack: 17 Damage: 16
Vanizi (confused no longer) wanders aimlessly north... 
Davis hastily destroys the glabrezu!
Magrea will cast a starry wisp at the hobgoblin behind the party, hitting the assassin. 
Robed Figure is nowhere to be seen - but from the area around the pentagram a bright streak flashes towards you, then blossoms with a low roar into an explosion of flame! (Vanizi, Katarina, Daviz and Zyllyne must make a DC 20 Dexterity saving throw, taking 41 fire damage on a failed save, or half as much damage on a successful one.)
Katarina (no longer confused)
Zyllynne 
Thrixi 
Vesta (no longer confused) sends a flurry of magic missiles towards where the fireball originated. The robed mage reappears, crumpled to the ground of the chamber with smoke still rising from his torso! (Nice job!)
Duergar mage

Updated map

"OUTTA MY WAY!!!" Zyl screeches as she flutterstomps back toward the hobgoblin and duergar, taking a swing or two at the hobgoblin first.

Action: attack

Attack 1: 21 to hit; 9 thunder + 6 (elemental cleaver) + 3 rage bonus = 18 damage

Attack 2: 15 to hit; 17 thunder + 4 (elemental cleaver) + 3 rage bonus = 24 damage

Bonus Action:

Mighty Impel: Zyl grabs the duergar and attempts to hurl them back to land next to Davis and Katarina! (Strength save, DC 16 to avoid)

DEX save: 20

Davis Dex: 27

[If your within 10' of me, you have Advantage AND +5 on the save, due to my Aura and my Sword.]

Round 3 (con't):
Hobgoblin Assassin The hobgoblin and duergar heard the fight and have come to see what is happening! The hobgoblin assassin makes a surprise attack against Magrea with his light crossbow - Attack: 17 Damage: 16
Vanizi (confused no longer) wanders aimlessly north... 
Davis hastily destroys the glabrezu!
Magrea will cast a starry wisp at the hobgoblin behind the party, hitting the assassin. 
Robed Figure is nowhere to be seen - but from the area around the pentagram a bright streak flashes towards you, then blossoms with a low roar into an explosion of flame! (Vanizi, Katarina, Daviz and Zyllyne must make a DC 20 Dexterity saving throw, taking 32 fire damage on a failed save, or half as much damage on a successful one.)
Katarina (no longer confused)
Zyllynne works her way back to the last two attackers, pounding the hobgoblin and then trying to toss the duergar! (DC16 STR save: 5)
Thrixi 
Vesta (no longer confused) sends a flurry of magic missiles towards where the fireball originated. The robed mage reappears, crumpled to the ground of the chamber with smoke still rising from his torso! (Nice job!)
...Posting for the duergar's save...

Round 3 (conclusion):
Duergar mage flies through the air - into Magrea and Vesta!! (They were right behind Zyllynne and blocked the passage...) He gets to his feet, speaks an arcane phrase, and blasts a cone of cold at the party! (All except Zyl make a DC14 Con save, taking 42 cold damage on a failed save, half damage on a successful one!)

Updated map

Round 4:
Hobgoblin Assassin steps towards the giant fairy, drawing two shortswords and engaging her in melee. (Attack #1: 14 Damage: 18 <> Attack #2: 20 Damage: 17. For any hit, make a DC 15 Constitution saving throw, taking an additional 17 poison damage on a failed save, or half as much damage on a successful one.)
Vanizi  
Davis 
Magrea  
Katarina 
Zyllynne 
Thrixi 
Vesta 
Duergar mage

Davis CON Save: 17

As a bonus, Davis will cast Misty Step and appear between the Mage and the Assassin. He will then set his blade on the mage, then assassin if the mage falls.

30 dmg: 15

25 dmg: 13

16 dmg: 13

20 dmg: 9

(1 hit to Zyl, Con save: 19)

Zyl hp: (-56)

Zyl turns her rage towards the Duergar!

Action: attack

Attack 1: 16 to hit; 10 thunder + 5 (elemental cleaver) + 3 (rage bonus) = 18 damage

Attack 2: 25 to hit; 14 thunder + 4 (elemental cleaver) + 3 (rage bonus) = 21 damage

Con Save - 27

Vesta shrugs off the worst of the cold magic, but it still hurts. The hobgoblin is closest to her now so she turns her attention on him. Davis and Zyl seem to be giving the duergar a good walloping besides. Since she is close enough, she reaches out toward the hobgoblin with her hand and unleashes lightning!

Shocking Grasp - 14 to hit (but it was a nat 1 :/)

(Con save- 5)

Magrea falls as a result of the blast of cold

(Vanizi CON Save: 10 - fail)

The half-orc shivers as the cold spell blasts her directly. Vanizi sees the Hobgoblin near Zyl and launches a trio of Eldritch Blast beams at it. 
(Spell Attack: 15, Damage: 15)
(Spell Attack: 20, Damage: 9)
(Spell Attack: 20, Damage: 9)

Katarina's saves:

Dex - 20 (15, +5 because she's standing next to Davis)

Con - 30 (25, +5 for standing next to Davis)

The feline shrugs off the worst effects of both the fire and the ice. In total she takes 16 damage from the fireball and 21 from the cone of cold.

Round 4:
Hobgoblin Assassin steps towards the giant fairy, drawing two shortswords and engaging her in melee. (Attack #1: 14 Damage: 18 <> Attack #2: 20 Damage: 17. For any hit, make a DC 15 Constitution saving throw, taking an additional 17 poison damage on a failed save, or half as much damage on a successful one.)
Vanizi launches a trio of Eldritch Blast beams at the hobgoblin, dropping the assassin! 
Davis Misty Steps next to the Mage and makes quick work of the duergar. (Combat over!!)

Davis walks over to Magrea, mutters a prayer to Lady Luck and pulls the Tiefling to her feet, "This is no place to take a nap" he says with a smile.

Lay on Hands for 10 points of healing.

"That should get you on your feet while we decide what to do next."

Vesta shivers, still fighting off the effects of the cold magic.

"Do we dare press on?" she asks. "We took a bit of a beating, but I don't think anywhere down here is safe enough to stop for a bit and tend to our wounds. What do you think?"

She directs her question at the rest of the party.

"I think we could rest up and continue on," Vanizi suggests. "We can't just retreat at this point. We've hardly started."  She pauses, "I need to be healed, but I can cast Cure Wounds twice. Maybe amongst the rest and all of us we can take care of our injuries."  

She first casts the spell on herself to heal a bit. (27 hp healed - now at full hp) 

(OOC - For Vanizi, she'll get her spell slots back after Short Resting. And folks could use hit dice to recover hp.) 

Magrea opens her eyes and smiles as she stands.

"Thank you, Davis. What a weird feeling..." 

She looked around to her companions and nods,

"Yeah, we're not in the best shape are we? It might be better if we hunker down in here. We can close the doors so nothing can creep up on us."

"A short rest sounds like a good idea, I can heal a bit more, let's see how we feel after the rest."

Can we do a quick search of this room, the bodies and maybe look down the other halls to see if it appears safe to rest here?

Perception: 17

Unfortunately, there is no time for a rest as you hear someone shout "What in the nine hells is going on in there?!!?" The voice comes from the north (to the left on the map because it's turned sideways!)

You have about 10 seconds (2 rounds) before whoever owns that voice appears to find out what, exactly, is going on...

Katarina, who was just about to curl up and take a nap, growls in frustration.

"Come on! Can Katarina get no peace and quiet?" the feline snaps. "Katarina needs her beauty sleep after being lit on fire!"

But she sighs and pulls out her shield and rapier, ready for another fight.

"Could someone please heal Katarina a little bit?" she asks. "Katarina is still a bit hurt... and her rage perhaps might not fuel her forever if she must keep engaging in such unladylike confrontations..."

(OOC: Translated into game terms, Katarina has taken significant damage and I'm not sure she can afford to keep burning her Rages)

Vanizi comes over to Katarina, touching her shoulder as she casts Cure Wounds on her. (Heals 24 hp) "I hope that will help. I have a tiny bit of healing left, but that uses most of my spell power until I get a little rest." 

"I suspect that whoever is calling is allied with the others we fought. Perhaps we take some cover, let them come to us, and take them by surprise?" she suggests.