(Thanks)

Rerolls for Empowered Spell: 27

 It only nets and extra 3 point of damage.  So 47 on a failed save, 1/2 on a successful save.

Keyleth's insightful fighting automatically applies (it can''t roll higher), and surely enough, both her strikes land with surprising ferocity. The foul, rotten creature seems far worse off than before, but it still groans and prepares to attack. 

The fiendish form of Avarice dodges the first blow, but Wulgar's second catches it in the side. It lets out a howl in pain. 

While Avarice feels his hex apply, the three eldritch blasts launched his duplicate's way simply rebound off its form. The fiendish duplicate grins; it seems lower-level magic has little effect on him. 

Soulwrenched Avarice con save: 19 - similarly, Varan's Blight wracks the being's form, but the effect is significantly reduced. 

Each of Mulligan's daggers strike into his copy's form, landing with great impact. The being lets out one final, pitiful moan, before slowly keeling over. 

Ragnar raises his shield and brings his sword against the steel, causing a now-familiar sound to ring through the air in a comforting manner - bless upcast to level 3 to target all except himself. 

The fiendish form of Avarice whips around several chains at blinding speed after sidestepping around Wulgar, each directed towards the true Avarice, anger clear on its face. "You'll pay for the decisions you made! I sit in the hells, tortured and forced to torture. Now it's your turn."

Chain Attack (Avarice): 27 Damage: 16 bludgeoning; if it hits, make a DC13 Constitution saving throw.
Chain Attack (Avarice): 15 Damage: 8 bludgeoning; if it hits, make a DC13 Constitution saving throw.
Chain Attack (Avarice): 11 Damage: 10 bludgeoning; if it hits, make a DC13 Constitution saving throw.
Chain Attack (Avarice): 11 Damage: 11 bludgeoning; if it hits, make a DC13 Constitution saving throw.
If any of the saves fail, you are frightened. If two fail, you are stunned for one turn. 

The creature turns towards Wulgar and whispers a spell - Wulgar, make a Charisma saving throw. 

     Mulligan sheds no tear nor wastes no time on the mimic of himself.  Instead he turns to see how his allies are doing and sees the faux Averice still standing. Grabbing two more of his daggers he once more unleashes them…

First Dagger Attack:  Attack: 15 Damage: 10

Second DaggerAttack:  Attack: 23 Damage: 8

Plus Sneak Attack: 16 added to first hit...

Will skip Flourish this time, but move 30 feet towards center of clock face. Actually, will try to recover first two daggers then move…

Wulgar charisma save : 19 plus bless : 1 

Quote from Kaemgen >>

     Mulligan sheds no tear nor wastes no time on the mimic of himself.  Instead he turns to see how his allies are doing and sees the faux Averice still standing. Grabbing two more of his daggers he once more unleashes them…

First Dagger Attack:  Attack: 12 Damage: 8

Second DaggerAttack:  Attack: 10 Damage: 9

Plus Sneak Attack: 14 added to first hit...

Will skip Flourish this time, but move 30 feet towards center of clock face. Actually, will try to recover first two daggers then move…

 I did forget Bless…. That would raise the attacks to:’

1st - 13

2nd - 16

One of the chains hits the true Avarice in the chest, cracking a few ribs. 
Avarice Con save: 6 + bless: 3
Avarice Con save to keep concentration on Hex spell: 19 + bless: 1

Varan casts greater invisibility targeting himself.  He then moves 15 feet west.

Avarice will take the dodge action and move as soon as those before him have acted.

Keyleth looks over at the corrupted Avarice, giving it that same critical look she gave the drunken Mulligan. It's the look of someone trying to figure out how to best mess him up.

Insightful Fighting: 34 (min of 24)

She runs to him (taking the bottom-left diagonal route, it's 35 feet) and slashes.

Attack: 15 Damage: 8 piercing
Sneak attack: 33 piercing

The ever-shifting clock's hands force Mulligan to dodge instead of focus on his daggers - one hurls off into the distance and clatters on the glass face, but the second strikes. Unfortunately, the nonmagical blade merely deflects off the being's whirling chains. 

(Keyleth - see discord; diagonal movement isn't allowed. I assumed you took the dash action instead, making that attack valid & a hit. Let me know if you would like to have changed your action there.)
Keyleth darts forth, slashing where the chains seem the most vulnerable, causing a spark to flash upon impact. 

Avarice prepares to dodge oncoming blows - feel free to let me know where you moved. 

Varan fades from sight and repositions. 

Ragnar dashes forth; a spiritual weapon materializes and takes a swipe at the Fiend. 
Spiritual Weapon Attack: 26 Damage: 10

Despite Ragnar's blessing, Wulgar feels his mind wrenched from his control. The devilish Avarice forces Wulgar to move forwards, taking two reckless swipes - one against Ragnar, the other against Keyleth. 
Wulgar Greataxe Attack (Ragnar): 21 Damage: 15
Wulgar Greataxe Attack (Keyleth): 24 Damage: 10
On the first hit, an additional 12 necrotic damage is dealt. 

The devil itself raises its arms into the sky - a portal tears into the sky, catching a glimpse of an infernal hellscape beyond; fires burn, screams emerge, and the scent of brimstone floats through the air. A devilish, comely woman flies through, wielding a bow and wings. 
Soulwrenched Avarice - summon erinyes. 

The Erinyes levels its bow, taking three shots - one at Ragnar, another at Avarice, the third at the invisible Varan. 
Erinyes Longbow Attack (Ragnar): 23 Damage: 6 plus 13 poison.
Erinyes Longbow Attack (Avarice): Attack: 11 Damage: 10 plus 15 poison.
Erinyes Longbow Attack (Varan): 26 Damage: 11 plus 21 poison.
Additionally, upon a hit, all must make a DC 14 Constitution saving throw or be poisoned. 

Wulgar Brutal Critical: 12

The clock suddenly surges - time begins to crack; you feel old wounds reopen and new wounds close - the clock's hands swing, causing you to duck. 

What time is it? - 15
Tick, tock - 2

The gears of the grandfather clock abruptly halt - pointing towards the headless Ragnar and the frostbitten, drowned Wulgar. The former lurches forth, dragging a curved blade on the ground - the second collects mist around its mouth, cold to its very core. 

The others - including the fiendish form of Avarice - freeze, protected and prevented from moving by chronal energy. 

Everyone's up. Wulgar, you're no longer dominated...for now. 

Wulgar assumes that since Avarice is frozen in time, he will not attack him if he takes the opportunity to move away from him (let me know if this is not the case).  Wulgar moves 3 steps to the east and 2 steps south, and throws two javelins at the headless Ragnar.  

Javelin 1 : Attack: 30 Damage: 17 

Javelin 2 : Attack: 11 Damage: 10 

     "Dude!  You've totally lost your head!  Now you're nothing but a brainless copy of yourself!  Probably lost more than just you're head, too..." Mulligan calls out, casting Vicious Mockery at the Headless Ragnar.  Wisdom DC 18 save or 7 psychic damage AND disadvantage on it's next attack during it's turn. 

...

At last... distant enemies closely bunched together.  These are my kind of targets.... thinks Varan.

Varan moves 15 feet east/right on the map.  He then casts cloudkill at base level 5 centered on a point between the new, more handsome versions of Ragnar and Wulgar.  A cloud of noxious green and yellow gas emerges on the battlefield.  He also burns two sorcery points, one for Empowered Spell (allowing for reroll of up to 5 damage dice) and one for Subtle Spell (for no verbal or somatic components and to not give away his invisible position).   As this is poison damage, Varan's Green Dragon Ancestry elemental affinity kicks in and adds +5 damage to the roll.  When a creature enter the spell's area for the first time on a turn or starts its turn there, that creature must make a CON saving throw DC 18. The creature takes 23 poison damage on a failed save, or half as much damage on a successful one. Creatures are affected even if they hold their breath or don't need to breathe.

Rerolling 4 of the damage dice: 21

 New total 34 damage or 1/2 on a save.

Avarice turns and blasts Headless Ragnar with three beams of purple crackling force.
Eldritch blast: 15 Force: 12
Eldritch blast: 15 Force: 9
Eldritch blast: 28 Force: 13

Keyleth uses her insight on the drowned Wulgar, then draws her shortbow and shoots him.

Insightful Fighting: 25 (min 24)
Bow attack: 25 Damage: 8 piercing
Sneak attack: 18

She then uses her full movement to get closer to the two enemies.

Both of Wulgar's javelins fly, but only one lodges in the plated knight's armor. 

Headless Ragner DC18 Wisdoms saving throw: 11 - the held head of Ragnar doesn't move, but the body swerves as if disoriented. 

Drowned Wulgar DC18 Con save: 20 - the nearly frozen Wulgar sputters a hacked cough, but the dead Ragnar continues to move, unimpeded by the cloud. 

All three of Avarice's eldritch beams blast into the undead form! 

(Drowned Wulgar can't make that Deception check). Keyleth's bold sinks into the drowned Wulgar's chest - but both forms continue to shamble forwards. 

Ragnar dashes forth. 

Through the cloud, a blast of sheer cold emanates from the frigid, drowned Wulgar, encompassing Mulligan, Varan, Avarice, Keyleth, and Ragnar. Each of you must make a DC 17 Constitution saving throw for half of 184 cold damage. 

The headless Ragnar lurches forth with surprising speed; necrotic energy gathers on its blade as it makes two strikes at Wulgar, one at Keyleth. 
Bonus Action: staggering smite
Longsword Attack (Wulgar): 27 Damage: 9 plus 20 necrotic. 
Longsword Attack (Wulgar): 13 Damage: 7 plus 25 necrotic. 
Longsword Attack (Keyleth): 28 Damage: 11 plus 19 necrotic. 
On the first hit, the target takes 15 psychic damage and must make a DC 18 Wisdom save or suffer the effects of staggering smite. 

I messed up that cold damage roll. Whoops. Here's the real roll: 25. 5d6, not my typo of 51d6...