Ladrian whispers a horrific, distressing melody that only Xolkin can hear. The Zhent turns his head away from Ladrian briefly and has a look of disgust and pain on his face, but he fights through the discomfort and takes a stab at Ladrian as he attempts to leave the fight...

• Opportunity attack w/ scimitar: 11 | Slashing damage: 7

Ladrian reacts, and dodges at precisely the right moment, causing Xolkin to miss. 

(Actions for Carrow and Vigan are next)

Vigan

Finally regaining control of his horse, Vigan wheels it round and charges the Zhentarim sparring with Rixton (#2).

Attack 1: 12

Damage 1: 13

Precision Attack 1: 16 (amended roll for attack 1)

Attack 2: 9

Damage 2: 8

Polearm Master Attack: 26

Polearm Master Damage: 8

Carrow 

Seeing his companions still engaged with the remaining Zhentarim the ranger moves southward at a walk and fires his bow and Xolkin.

Attack1: 27  Damage: 11

Hunters Mark: 6

Attack2: 11 Damage: 6

Hunters Mark: 2

Vigan closes in on Zhent 2 and catches his opponent with two of his three strikes. The Zhent is knocked back a few feet by the blow from the end of the goliath's glaive, but he steadies himself and prepares to retaliate.

Meanwhile, Carrow continues his approach to the main battle. He comes to a halt and again draws his bow, striking Xolkin twice. 

 (Round concluded. Andor may act and begin the next round. Both Zhentarim will then follow)

Andor

Seeing Xolkin as the greater threat Andor blasts at him with his Ray of Frost hoping to wear him down more. He then moves 20' east to make himself a less obvious target for his opponent.

Casts Ray of Frost attack 24 for 10 cold damage 

An icy beam of energy strikes Xolkin, causing him to twist awkwardly in the saddle. Recognizing that Rixton is sorely wounded and, furthermore, that Ladrian and Andor wish to keep their distance, Xolkin turns his horse and charges toward Larg. Upon reaching the dwarf, Xolkin slashes through the rope that restrains Lord Kirby.

A short distance away, the other Zhent is locked in combat with Vigan. With scimitar in one hand and dagger in the other, he darts left and right, swinging his blades at the goliath...

• Scimitar attack 1: 24 | Slashing damage: 5
• Scimitar attack 2: 13 | Slashing damage: 4
• Dagger attack: 13 | Piercing damage: 6

(Actions for Carrow, Ladrian, Rixton, and Vigan are next)

Updated map: 

Rixton:

I ride over to Xolkin and smoothly dismount. "What is your plan here, Xolkin? Ride away while we're keeping our distance and hope we never catch up to you?"

While I chatter at him I eye his own injuries to see what he is favoring. He seems to be trying to pretend an injury on his left side but I suspect his right is bothering him. I lunge unexpectedly with a short sword attack.

Bonus action - Insightful fighting: 14

Short sword (+1) Attack: 20 Damage: 5, add 8 if insightful fighting is successful.

After my attack, I reveal my real motive for getting close. I slap the rear of his horse as hard as I can, yelling, "Heeyah!" (interact with object)

Xolkin turns to face Rixton, but he has little chance to avoid the incoming attack. Rixton's blade penetrates deeply through the Zhent's studded leather armor. Despite being stunned by the pain, Xolkin manages to steady his horse and keep it from bolting. "Shrewd, Rixton...shrewd," he says through clenched teeth as he brandishes his dagger. 

(Actions for Carrow, Ladrian, and Vigan are next)

Vigan

The Zhentarim's (#2) blades slash at the goliath in quick succession, one attack leaving a deep cut in his forearm.  Vigan returns the favour with interest, repeatedly swinging his glaive at his foe, who falls before him.  The fighter then roars as he charges Xolkin on horseback, glaive swinging through the air...

Riposte Attack: 28

Riposte Damage: 18

Attack 1: 16

Damage 1: Unable to parse dice roll.

Polearm Master Attack: 26

Polearm Master Damage: 9

Attack 2: 18

Damage 2: 8

Precision Attack 2: 26

Action Surge Attack 1: 13

Action Surge Damage 1: 11

Action Surge Attack 2: 17

Action Surge Damage 2: 8

In a matter of seconds Vigan brings an emphatic end to the entire skirmish. Zhent 2 is able to parry one of the goliath's attacks, but, in the end, it does not save his life. As Zhent 2 is taking his final breath, Vigan surges toward Xolkin. With one final swing of his glaive, Vigan sends the last enemy flying from his saddle to die face down in the snow and forest debris. 

Vigan

Dismounting from Nyx, Vigan grasps what remains of Lord Kirby's rope, and walks over to the lifeless body of Xolkin, grabbing the harness of his horse in the process.  "Big mouth or not, I did promise you..."

Turning to the others, he gestures to the bodies.  "Nyx is fully loaded from Xantharl's Keep.  If there's anything on them worth keeping, you four should share the load."

Andor 

"Wow, don't mess with Vigan." Andor looks over the carnage, then stumbles a bit as the severity of his wounds catches up with him. "Just in time, I may be about to pass out, any chance we can take a minute to catch our breath?"

Vigan

"We should keep moving, Mirabar is not far away, and there could be more parties tracking our dwar....."  Vigan trails off as he notices his companions shambling towards him like the undead, cuts and bruises aplenty.

"My apologies, I did not appreciate the extent of everyone's injuries.  Carrow, can you help them at all?"

Larg looks sullenly at Xolkin's body and says, "Well, so much for my escape." 

Equipment, wealth, and other items belonging to the four Zhentarim are as follows:

• Zhent 1: 21 gold pieces, 10 silver pieces, 2 scimitars, 1 dagger, studded leather armor, and riding horse with tack
• Zhent 2: 21 gold pieces, 7 silver pieces, 2 scimitars, 1 dagger, studded leather armor, and riding horse with tack
• Xolkin: 19 gold pieces, 10 silver pieces, 2 scimitars, 1 dagger, studded leather armor, and riding horse with tack
• Zhent mage: roll]5d6[/roll] gold pieces, 5 silver pieces, and a rather finely-crafted ring

Edit: 18 gold pieces on the mage

Andor 

"Let me see whether they had anything magical on them." Andor flourishes his wand of magical detection over the collected equipment. 

The mage's ring immediately emits a faint aura, signifying it is magical in some way. (DC 15 Arcana check to identify the item).

Rixton:

Arcana check: 9

Carrow 

Seeing the conflict end in a blur of Goliath and Glaive, a good title for a biography, the ranger moves between his wounded companions laying a hand on each as he goes.

Andor, Cure Wounds 2nd Level. 9

Ladrian, Cure Wounds 2nd Level, 6

Rixton, Cure Wounds 1st Level 6

"I have the capacity to do more, i am not fully spent yet, how do you fare big man?"

Andor 

"Oooo that feels better, my thanks Carrow."

Arcana 4 to identify the ring

Edit: Andor isn't even sure its a ring...

Suddenly a flash of inspiration strikes the sorcerer, is this something he once saw in an old tome he briefly flicked through in a shop selling arcane items... 

Arcana reroll from lucky feat 7

Edit: terrible.. 

Carrow 

"You are welcome, whats this you've found?"

Arcana 15