Day 1

Zombie

Actually, I've changed my mind, since you already rolled to hit Elrond already rolled to hit we will stay with that a suprise round .
Frech, please confirm you misty step to the cave entrance or let me know where exactly do you end your turn which ends with zombie turning to the sound of spells cast. Stones nearby zombie cover in ice as the spell miss zombie. And we begin first round in initiative order:

Elrond 16 (I've decided he wins tie this time)
Bellow 16
Zombie 6
Phoenix 4
Anguis 2

Note: Anguis will not be able to move if Phoenix don't move because corridor is so narrow you can't squeeze.

Elrond misty step and nat1 was surprise round. You go first in the next round. I need you to describe your next turn
P.S. Since you did not see zombie before misty step I just assume it was coincidence you appeared on the edge of your darkvision

Second ray from Elrond’s had hit Zombie directly in chest freezing his stomach, when zombie start moving few frozen limbs break and crumble, but Zombie start running toward Elrond. Well… very slowly running as he could now only cover 20 ft even dashing. Nevertheless when he as only made his first 5 feet you see a stalactite falling on the zombie from the ceiling and one more fallen on the Elrond. While neither of you expected it, I’m rolling with advantage both:
You all could see that this is actually a creature not a stalactite.


Zombie however continue moving towards Elrond ignoring the thing that just fall on him and Bellow could use his reaction to throw the javelin
Meanwhile two of the dead bodies (and there are hundreds of them around) rise as zombies, disturbed by spell casting and moves toward Elrond. One of them even manage to reach him with attack.

Total:Elrond takes 7 HP damage, and zombie takes 5 (on top of 10 frost damage taken already) but keep moving.
The creatures that fall are trying to move away very slowly, but the one hit Elrond leaves his reaches so you would be able to do opportunity attack... if you had a melee weapon, which you don't, so sorry. So it start crawling the wall, but is still no more than 5 ft above ground.
Bellow, roll your Javelin
Everybody: describe your next turn actions (without waiting for your initiative). I will resolve them in initiative however. I don't mind if for example Anguis wait for Phoenix. I just want to allow you post as soon as you are sure what you do despite of what the other does.

Phoenix and Anguis moves step-in step through the corridor, but Phoenix step to the righ, while Anguis runs towards zombie. Phoenix see that one zombie has less flesh on his right shoulder and blasts it off together with the arm doing 2x9+3=21 damage (another crit!) while Anguis swings his sword into the now open chest, cutting through the chest. However there is a chance zombie still stands:

Bellow, with one zombie down during first round, I will allow you to chose with of other two zombies you will be attacking

Bellow and the zombie on the east runs simultaneously, but Bellow is faster. He reach zombie in front of Elrond and swings his handaxe at the zombie should almost cutting a hand off. He then moves even closer to Elrond to escape incoming zombie attack and swing the second axe, scratching zombie this time. This attracted zombie however and allows to Elrond swings his quarterstaff right at the at zombie head. Zombie still standing and manages to Slam Bellow

The creature on the wall crawls upward and is not 15 feet high where wall changes to the ceiling, but it does not stop him from crawling.