@Soloth

You heal Elandra further, hoping to bring her back to her feet

@Elandra
The weasel runs to the other side of Norbus and attacks the shaft: Attack: 22 Damage: 1

Vyldara Wis Save: 11

@Elandra

Vyldara fails to save against your spell, but expends her final point of legendary resistance to avoid being pushed back, taking 6 damage. The weasel attacks the catacombs, but does minimal damage

At the end of your turn, now completely furious, she whips around to look at @Lux, and casts Chill Touch on him. Lux, make a DC 16 Con Save or take 4 damage.

@All
 
(Lair Action): You all look towards the catacombs, expecting ghasts to emerge.. and none do. Just as you let your gard down, Vlydara waves over at the toxic moat and three tentacles of toxic water fly out, one hitting Jade, one hitting Lux, and one hitting Liri. 

All three of you need to make two DC 15 Con Saves. Based on the result, here is what happens:
Two Fails: You are poisoned until your next turn and take 16 poison damage
One Fail: You are poisoned until your next turn
No Fails: You entirely resist the effects

@All (Note: Above effects should say poisoned until the end of your next turn

The ghouls then begin to move, redy to strike at the nearest foe
Ghoul 13 runs back in and converges with Ghoul 8 on Norbus, both swiping at him (damage halved, shared with statue)
Attack: 5 Damage: 8
Attack: 16 Damage: 4
Ghouls 17, 21, and 22 all swipe at Jade
Attack: 11 Damage: 8
Attack: 16 Damage: 5
Attack: 16 Damage: 6
Ghouls 23 and 24 swipe at Liri
Attack: 19 Damage: 9
Attack: 9 Damage: 8

@All

Both ghouls miss Norbus, but Jade and Liri are each hit once. I need aDC 10 Con save from both of you to avoid paralysis. In total, here are the rolls I need

Lux: DC 16 Con for Chill Touch, Two DC 15 Con for the lair action
Liri: Two Dc 15 Con for lair action, DC 10 Con from ghoul
Jade: Two Dc 15 Con for lair action, DC 10 Con from ghoul

Lux is up! Map Update:

@DM - None of Elandra's or the duplicate's movement is on the updated map.

Con saves for lair action:

22

3

Con saves for ghoul:

12

So I think that's 7 damage total for me plus poisoned until next turn.

Lux

DC 16 Con for Chill Touch, 
CON Save: 4

Two DC 15 Con for the lair action
CON Save 14

CON Save 17

Lux will be getting out of the stream and moving towards Jade to heal her. He will Dash if needed. Lux takes the 4 damage. 

@Elandra: Updated your movement on the map. Duplicate actually should be gone since you fell unconscious 
@Liri: You take the 7 and are poisoned until the end of your next turn, but avoid paralysis

@Lux

You fail one save, becoming poisioned until the end of your turn. You take a dash action, rushing towards Jade, and the poisoned effect wears off

@All

Vyldara whips around to Elandra, having used up the last of her resistance on Elandra's spell. In a fit of utter rage, she bellows "You call that a wail, little half-elf! " and charges in between Elandra, Soloth, and the statue. 

As she moves, the horrid stench in the air grows even stronger, and the sun seems to darken for a moment as she channels the spite and malice that binds her to Axeholm and to the mortal plane, every bit of her banshee magic flowing through her as she cackles and finally unleashed her terrible wail. @Elandra, @Soloth, the cacauphanous sound is almost instantly overwhelming to your ears and the ears of the statue, who staggers back as she howls. 

Make a DC 13 Con Save. If you fail, you drop to 0 hit points instantly. If you suceed, take 14 psychic damage
Statue Con Save: 22

@All

The statue saves, but looks noticeably rattled. Concentration for Aura of Vitality: 16

The ghasts then rush at the nearest foe, continuing thier assault
Ghasts 7 and 9 rush at Norbus, swinging at him (damaged halved, shared with statue
Attack: 17 Damage: 10
Attack: 9 Damage: 12
Ghast 11 continues to attack Jade: 
Attack: 7 Damage: 12
Ghast 12 takes a swipe at Liri
Attack: 19 Damage: 11

@All

The statue manages to keep the spell going, and all of the ghast's attacks miss

Norbus takes 3 heavy swings, starting with Ghast 7 and moving across if it dies
Attack: 23 Damage: 12
Attack: 20 Damage: 8
Attack: 20 Damage: 16

@All

Norbus finally finished off both Ghast 7 and Ghoul 8, and the previously undamaged Ghast 9 takes an incredibly heavy hit. Koric is up! Map update:

Hoping that those surrounding the pit will be able to close it or, he hopes fleetingly, that Vyldara's army is exhausted, Koric summons up his magic and this time launches four missiles at the undead elf.

Magic Missile (L2): 18

As his missiles fly toward the Vyldara, Koric asks Balthar to assist anyone Liri again -- either attacking the undead or the pit walls.

Con save vs wail - 5

Jades CON saves

18

17

18

Lux catches his breath, calms his mind and prays to Lathander for guidance on how to close this opening and stop the evil from escaping. (If it's a simple thing, he will do it as a free action. If needed he will use his next action to do this)

@Koric

You hit Vyldara with an incredibly heavy round of magic missles. She looks truly on her last legs at this point, struggling to fly as your magic begins to overwhelm her

At the end of your turn, Vyldara moves 35ft NE and 5ft N, not taking any opportunity attacks

@Elandra and @Soloth - The wail overwhelms both of you, and you both drop to the ground, instantly reduced to 0 hit points

@Lux - There is no way to close the catacombs other than attacking them from mele range, as the forcefield around them protects them

@All

The statue, staggering, looks absolutely horrified as it watches Elandra and Soloth fall to the ground. With minimal magic left in it, it cannot heal both of them, so it instead runs at Vlydara, following her by 30ft, and takes a dodge action to avoid future attacks. He turns to Soloth and uses the ongoing Aura of Vitality to heal him for 7, hoping the temporary boost will be enough to keep him alive

Liri is up!