(I don't know why but it's wouldn't roll the first set so I added another, I will err on the side of the players and use the second set. Your side goes first, in any order. Warriors are to the North, East, South, and West. Figures are in between: NE, SE, SW, NW.)

(Just for future, Jayce has +7 to initiative haha)

Jayce draws his rapiers and runs to the closest warrior to take his attacks with the Mind Blade. (He gets 4 attacks cause of gloomstalker ability)

17 Damage: 20

23 Damage: 14

29 Damage: 17

26 Damage: 22

(Action surge)

17 Damage: 16

22 Damage: 16

26 Damage: 25

30 Damage: 30

(If for some reason an enemy drops, Jayce will move to the next nearest target.. He had 40ft movement first turn. If an enemy attacks him, Jayce will use his reaction defensive duelist to add +5 to AC bringing it to 25)

Edit: Using precision attack maneuver on the 12 to hit.. hopefully this will be enough 4

The light beneath Cailan's mask glows brighter in excitement as the enemy surrounds them, and he pats the neck of the pegasus, bidding it to fly up and around the group to search for any more enemies, or indeed anything else of interest.

He bows his head as he invokes the blessing of a higher power. "Grant us the strength to overcome this evil..."  Bolstered by holy fervour, he advances east to face the creatures on that side of the group, drawing the hilt of a longsword alongside his shield.

"Face us foul creatures, and know your doom!"  As he cries out, a beam of pure radiance bursts from the hilt, forming a blade which hurts the eyes to look at.  He raises his shield and awaits their charge.

Cast Bless

"Let's giv' 'em a figh, eh guys!" Bardic Inspiration on Dust

"This place is dim, yet brighter than the ideas in your head!" Vicious Mockery on the closest target (WIS saving 18, Damage: 5 psichic)

Darkfire

Darkfire launches himself into the air, uttering and arcane word in Draconic "Ngeb"  and immediately his shape seems to fade and blur...holding his axe in one hand, he points at the nearest ethereal creature uttering more draconic  "bah naQjej" and a bolt of fire shoots towards at the creature.

fly 20 feet directly up. cast Blur

Spend 2 Sorcery point and cast [Tooltip Not Found] as a bonus action

Attack: 17 Damage: 30

 not sure if bless is active yet or if it would be enough anyway.....3

Moving on all fours, the Tabaxi sets off at a run towards the nearest enemy.  He draws his blade as he nears the closest undead warrior looking for an opening to attack.  Seeing his chance, Dust In The Wind thrusts his sword at the creature before leaping into a roll and moving back into position to provide Jayce with cover, in the event that he is unable to free himself from the chain that binds him.  

Meta:

(Jayce's turn; Take 2)

Jayce tries his to break out of the chains. (I'm assuming it's a strength save) 24

(If successful) Jayce moves 40ft closer to the nearest enemy.

(If unsuccessful) Jayce sheds a single tear.

(edit: FK YEEEEEEEEAAAA)

Jayce miraculously shatters the chain binding him to the ground. There is an explosion of light that seems to damage all the approaching undead. He then darts North toward the warrior there.
(Each enemy takes 12 radiant damage)

As Cailan's Pegasus ascends above the decrepit treetops, his sword emits brilliant sunlight; however, the shadows of this world seem to hold the swords light back from its true splendor. Still the enemies in the East seem enraged by the light.
(The sword only emits bright light in a 15 ft. radius, but not dim light for the extra 15 ft.)

Eliodos mocks the warrior to the East as Cailian approaches.
(WIS Save v Vicious Mockery, 19)

Darkfire launches into the air, shifting in a blur. He shoots a firebolt at an incorporeal figure to the Soutwest. With the magic blessing from Eliodos his bolt strikes true, but is resisted by the figure.

Dust darts forward with unparalleled quickness and sinks his sword into the warrior to the North. He springs back unphased as Jayce approaches the area, ready for the undead's retaliation.

The North warrior charges at Jayce and Dust sword-in-hand as the Northeast and Northwest incorporeal undead close in from the sides.
(Longsword v Dust, 16 to hit, 9 slashing damage)
(Longsword v Dust, 5 to hit, 10 slashing damage)
(Life Drain v Dust, 20 to hit, 23 necrotic damage, on a hit Dust must make a DC 14 Constitution saving throw or his hit point maximum is reduced by an amount equal to the damage taken)

(Life Drain v Jayce, 25 to hit, 25 necrotic damage, on a hit Jayce must make a DC 14 Constitution saving throw or his hit point maximum is reduced by an amount equal to the damage taken)

The warrior to the East will take out a bow and fire two shots toward Cailan while the figure from the Southeast plunges into the sunlight to attack.
(Longbow v Cailan, 17 to hit, 9 piercing damage)
(Longbow v Cailan, 13 to hit, 10 piercing damage)
(Life Drain v Cailan, 20 to hit, 24 necrotic damage, on a hit Cailan must make a DC 14 Constitution saving throw or his hit point maximum is reduced by an amount equal to the damage taken)

The remaining figure flies into the air with spectral quickness to engage the winged dragonborn.
(Life Drain v DarkFire, 23 to hit, 18 necrotic damage, on a hit DarkFire must make a DC 14 Constitution saving throw or his hit point maximum is reduced by an amount equal to the damage taken)

While the warriors to the South and West take pot shots with their bows at Eliodos.
(Longbow v Eliodos, 7 to hit, 3 piercing damage)
(Longbow v Eliodos, 6 to hit, 7 piercing damage)
(Longbow v Eliodos, 21 to hit, 5 piercing damage)
(Longbow v Eliodos, 18 to hit, 3 piercing damage)

(Damage to enemies so far, North 21, East 17, South 9, West 9, Northeast 9, Southeast 9, Southwest 19, Northwest 9)

(extra 3 piercing damage for the crit against Eliodos)

"You want me to be a pin cushion but I'm becoming a hedgehog, those arrows you shoot are just spikes I can use later" vicious mockery (WIS 18 save, dmg: 6 )

As a Bonus action he also hexes the target (before mocking them) so add 5 to the damage roll if it hits

 Darkfire will cast Shield causing the  enemies hand to stop inches from contacting him...he smiles at the creature, and grabs his axe for a swing...noticing the creature seemed to shrug off some of the fire damage, he will try a different tactic...again uttering words of power

Attack using Booming Blade

Attack with axe 27 Damage: 8  Booming Blade Thunder Damage 8  BB damage if it moves 19   add bless to attack roll  4

spend two sorcery points to quicken Green Flame Blade[ and attack again as a bonus action

Attack with axe 21 Damage: 14  GFB Damage 8  bless to attack roll  2

After attacking he will fly directly away 20' risking the opportunity attack (ac is now 21 with shield up)

Jayce manages to avoid the attack against him as he rushes the closest enemy to him. He marks the enemy before take 3 attacks on him with his Mind Blade.

Attack: 18 Damage: 18

Attack: 16 Damage: 21

Attack: 23 Damage: 29
(All attacks, have mixture of piercing and psychic damage.)

Jayce then takes a defensive stands. (if he gets attacked, he will use his reaction for defensive duelist.. Increases his AC to 25 just for one attack.)

(If Jayce has bless then add these to the attack rolls: 1, 3, 4 )

(Jayce will use Precision Attack on the 12 to increase the to hit 1 )

(And if Jayce's target is within 5ft of another ally then sneak dmg: 3 )

Calian raises his shield as two arrows fly towards him, one deflected harmlessly away from him, the other nicking his upper arm.  He dodges the twisted magics of the dark figure before suddenly darting towards it, lashing out with his shield in an attempt to knock it over, swiftly followed by two slashes of the Sun Blade towards the figure's torso.

Athletics: 8

Attack 1: 24

Damage 1: 25

Attack 2: 22

Damage 2: 20

Jayce's strikes dissipate one of the ethereal figures in front of him as he prepares for incoming strikes.

Cailan attempts to knock the shadowy figure over, but his shield passes through the ethereal being. Dispite this, both his radiant strikes land. The figure is damaged but still remains.

Eliodos turns his attention to one of his attackers and mocks the warrior to the West.
(WIS Save v Vicious Mockery, 21, 6 psychic damage)

Darkfire strikes back at his attacker with thunder and flame before flying higher.
(Extra roll because I forgot blur from before, 18, opportunity attack 19 to hit, 18 necrotic damage, on a hit DarkFire must make a DC 14 Constitution saving throw or his hit point maximum is reduced by an amount equal to the damage taken)

Dust dodges any incoming attacks.

The North warrior continues it attack against Dust.
(Longsword v Dust, 15 to hit, 7 slashing damage)
(Longsword v Dust, 13 to hit, 9 slashing damage)

The shadowy figure from the Northwest turns its attention toward Jayce.
(Life Drain v Jayce, 9 to hit, 29 necrotic damage, on a hit Jayce must make a DC 14 Constitution saving throw or his hit point maximum is reduced by an amount equal to the damage taken)

The East warrior will continue firing at Cailan as the figure from the Southeast desperately strikes back.
(Longbow v Cailan, 17 to hit, 7 piercing damage)
(Longbow v Cailan, 7 to hit, 9 piercing damage)
(Life Drain v Cailan, Unable to parse dice roll. to hit, 22 necrotic damage, on a hit Cailan must make a DC 14 Constitution saving throw or his hit point maximum is reduced by an amount equal to the damage taken)

The Southwest figure follows DarkFire into the air, taking more thunder damage but still hanging on.
(Life Drain v DarkFire, Unable to parse dice roll. to hit, 23 necrotic damage, on a hit DarkFire must make a DC 14 Constitution saving throw or his hit point maximum is reduced by an amount equal to the damage taken)

The warriors to the South and West do they're best to turn Eliodos into a pin cushion.
(Longbow v Eliodos, 13 to hit, 3 piercing damage)
(Longbow v Eliodos, 12 to hit, 5 piercing damage)
(Longbow v Eliodos, 19 to hit, 7 piercing damage)
(Longbow v Eliodos, 22 to hit, 5 piercing damage)

(Damage to enemies so far, North 21, East 17, South 9, West 9, Southeast 54 bloody, Southwest 59 bloody, Northwest 9)

(Rerolling rolls that didn't work)

(Life Drain v Cailan, 8 to hit)

(Life Drain v DarkFire, 9 to hit)

Seeing no escape in the moment, the Tabaxi prepares for the oncoming attack.  He dodges and weaves around the first two attacks, but isn't quite fast enough to avoid the third.  While he is able to avoid taking the full brunt of the attack,  the blade finds purchase and he hisses in pain.  

• I will use uncanny dodge as a reaction to halve the dmg of the 3rd attack to 12.  The first 2 don't land. 
• CON save: 8  (edit: i will use bardic inspiration to attempt the CON save: 9

And then assuming we are taking our next turn

Dust in the Wind moves with Jayce, taking care to stay close, using his ally's positioning to set up his own attacks.  He looks for a weak spot and thrusts his blade, letting out a low growl as he does.  He pulls his blade back and brings his opposite hand from under his cloak, revealing a loaded hand crossbow.  The Tabaxi aims the weapon at another of the undead warriors and lets the bolt fly.  

Short Sword +2 Attack roll: 19  Dmg: 11 + Sneak Attack: 38 + Bless (if still applied): 3

Hand Crossbow Attack roll: 17 Dmg: 10 + Bless: 1

 Edit 2: Attack 1 hits, attack 2 misses.

I will use uncanny dodge to halve the damage to  5

Darkfire

Words of power crackle and invisible barriers snap into existence, deflecting incoming attacks of the creature....Darkfire swings his axe again....

Attack: 27 Damage: 17     add bless to attack 4  add6 thunder damage on a hit...  add10 if the creature moves again after being hit.

If the creature is still alive...he will spend two sorcery points to attack again with GFB.

Attack: 23 Damage: 17  add bless 4   GFB damage 17

If not he will use hte sorcery points to send a bolt at the creature to the South

Attack: 17 Damage: 25

The aasimar's shield meets both arrows, before he again interrupts the figure's incantations by smacking the creature in the face with it.  Regardless of the figure's response to the assault, Cailan swings furiously at its neck and shoulders.

Athletics: 16

Attack 1: 33

Damage 1: 37

Attack 2: 30

Damage 2: 18