Z10 WIS(14) check: 4

Lucien's spell causes the zombie to rot before his eyes until the corpse's arm and jaw drop off. It still shuffles along, unaware of the loss of its body parts.

The zombies plod forward. The smallest one, the girl of no more than 14, reaches Lucien. (15) It attacks one of the mirrors.

Attack: 4 Damage: 5

It utterly misses, nearly falling on its face.

The others are not quite in reach but continue shuffling and shambling towards anyone that they can see.

(Everyone may take their round 6 action.)

Tock shoots a zombie and then keeps moving back east some more. Is there anything else coming from that side? He also waits a bit for someone to engage one of the zombies before shooting the same one (for sneak attack damage). (or if the illusions count then just anything that's in range)

Attack: 11 Damage: 10

Feytok will move forward and hold. 

If the zombies advance into range melee attacks. Attack: 21 Damage: 16 BA Attack: 20 Damage: 8

If they don't get close enough he will throw the axe. Attack: 24 Damage: 8 (disadvantage for range. Advantage for reckless equals straight roll?)

Dog sees Z10 getting beat up, and also Keyrie, Tock, and FeyTok coming up behind him by the statue, and trusting they'll protect Nev and Genny, he surges forward to the left of Lucian's Army (stowing his bow and drawing his sword again). Seems like he can get just to the left side of the Lucians, into E11, if we can move diagonally?

He attacks Z12 with green flame blade: longsword 20 Damage: 5 (if it hits, 2 fire damage goes to Z8).

Realizing this fight's getting rather hairy... Acton surge. He attacks Z12 again with green flame blade: longsword: 21 Damage: 11 (if it hits, 2 fire damage goes to Z8).

(It looks like Dog can't quite make it to Z12, who is 45 feet away.)

Tock fires on Z8, striking it in the chest with a bolt. Z8 CON(15) check: 16

The little zombie adolescent is resilient and stays on her feet.

At the same time, Feytok charges forward and hurls his battleaxe at Z10, lodging the blade squarely in the zombie's face before it returns to his hands. The zombie falls to the ground, unmoving.

(Gash, Lucien, and Keyrie can all go. Dog can correct make a correction or a new post.)

Gash pulls out a spider from his component pouch having been inspired by his spider ride before and casts spider climb on himself and climbs his full speed up the pillar.

Guess I miscalculated distance, whoops!

Dog will move into the NW corner of E11 right alongside the Lucians, and make the one green flame blade longsword attack against Z8 (feel free to use the original, or this: Attack: 9 Damage: 7, with the 2 fire damage to Z9)

Dog charges up behind one of the mirror images dancing around the mirror copy of Lucien and thrusts his sword between the Luciens into the young zombie girl. Green flame spills over to the neighboring zombie, singing it's arm.

Z8 CON(12): 17

The adolescent zombie is resilient, as Dog slices out rotting innards that the corpse apparently did not need at all. It continues its undead assault.

(Keyrie and Lucien are up.)

(FYI Gash can't make it to the top of the statue this turn, but he did make it about 2/3 of the way up.)

Lucien will make his duplicate turn around and ‘moon’ the zombies, while wiggling their heinies in a mocking gesture.

for his action he will cast Guiding Bolt at Z7. Attack: 25 Damage: 18

 Lucien's bolt slams into the walking corpse, sizzling away a large portion of its chest, left arm, and left shoulder. It shuffles on, but severely weakened and glittering in the dark cavern, making it an easy target for the next attacker (next attack against Z7 is with advantage.)

(Keyrie is up.)

Keyrie will move the moon beam to on top of Z8 hoping to finally take it down.
17 (Con save of 13 for half damage)

(No CON save necessary for Z8. Radiant damage of any amount is enough to wipe out its 1 HP.)

Z9 CON(13) check: 12

The adolescent zombie bursts into a ghostly white flame and the zombie next to it is seared by a similar flame. The first falls into a charred heap on the ground, but Z9 remains standing with whatever magic is holding together its desiccated remains.

Z9 strikes back at Lucien's double (7) and swings at one of the mirror images of the double instead.

Attack: 14 Damage: 6. It misses horribly.

Z12 shuffles up to Dog and swings at him. Attack: 17 Damage: 6

And Z13 swings at Lucien's double (8) but swings at a mirror image of the double instead.

Attack: 8 Damage: 3. This mirror image is also safe.

Having walked into the moonbeam, though, Z13 also takes damage in the form of ghostly flames.

Z13 CON(13) check: 4. And it takes 9 damage as a result.

(Everyone may take their round 7 turn in any order.)

Feytok advances and attacks Z12 (Z13 if 12 is down). Reckless attack Attack: 12 Damage: 6  BA frenzy Attack: 20 Damage: 8

Tock would try to keep the threat somewhat localized and pick off stuff that separates, so he takes a shot at Z7 and then moves southeast a bit, motioning Neventi to follow.

Attack: 9 Damage: 22

Feytok slashes through Z12 twice, lopping off a hand and taking a wedge out of its chest. It is not quite enough to put the corpse back in the ground, however.

Tock, meanwhile, fires an bolt that almost misses Z7, except it walks into the shot. The bolt pierces the zombie through it's skull into it's right shoulder and it falls down, lifeless. (It couldn't pass a CON 27 check at all.)

(Keyrie, Dog, Lucien, and Gash can still go.)

Dog, glad to have FeyTok at his side, moves around Z12 to flank it with the fire genasi, and attacks with green flame blade longsword (and the 2 fire damage going to Z13 on a hit): 

Attack: 8 Damage: 1

If it doesn't drop, action surge attacking with longsword green flame blade: 14 Damage: 7

Gash climbs the rest of the way up with spider climb and then does a minor conjuration to summon a good sized boulder. 10lbs and 3 feet diameter then attempts to just drop it on z11

Z12 CON(8) check: 15

The zombie is struck but does not fall. Dog finds some reserves and strikes again.

Z12 CON(12) check: 14

The zombie continues to stand, despite pieces of its body falling to the ground at Dog's sword.

Gash climbs the rest of the way to the top of the statue and materializes a large rock, which falls towards Z11.

Attack: 18 Damage: 12

(Keyrie and Lucien are up.)

If the moonbeam isn't on top of some zombies Keyrie will use her action to move it on top of as many as possible.
Con Save: 13 for half damage: 14

If she doesn't need to move the moonbeam Keyrie will use her action to hit the closest one with her sling. 
Attack: 10 Damage: 3