The Yeti bellows a scream and turns its Chilling Gaze onto Kazri.  Kazri must succeed on a DC 18 Constitution saving throw against this magic or take 21 cold damage and then be paralyzed for 1 minute. She can repeat the saving throw at the end of each of her turns, ending the effect on itself on a success. 

The Yeti also reaches out and claws at her with its huge maws!

30 13 slashing damage plus 11  cold damage.

31 14 slashing damage plus 7  cold damage.

2nd hit is a crit so an extra 4 slashing  + 8 cold

Scratch that crit, no crits due to adamantine plate

Kazri is up

Kazri (57/76), Yeti (?)

(Oh Boy…)

Kazri is still trying to shake the stupor from the last test, even with the well deserved rest. She doesn’t expect to see anything outside of the tower. She slowly opens the door, and it violently opens, and she flies back. It takes her a moment to realize she is not dreaming, and there is a very large and dangerous enemy in front of her. Her instincts kicks in, and she makes sure to have her shield, and draws her sword.

Krom perception check 10 (DC18)

Frustrated by the door, Rhogar heard nothing beyond the sound of his own grumbling and that of any of the others. But Gorrah's keen senses had her looking sharply to the ceiling and exuding feelings of concern. With little more than a crude image of Kazri being sent to the party, she's off in a hurry for the stairs, startling Rhogar. "What was... wait... where's Kazri? She didn't... oh no..." Is all the Dragonborn had a mind to say before taking off after the celestial familiar. 

(Hope I didn't make too many presumptions with the above. But if so, feel free to make any changes. Previous post contains the checks rolled)

Perception: 13

The entire time Rekuberk has been quiet and seems to look over his shoulder, his sword having been drawn for the entirety of their trek after the ordeals.

(@DM I missed your post above, so I didn't realize it was my turn. Sorry about that.)

Kazri CON Save: 21

Kazri locks eyes with the creature, and for a fraction of a second, he hands freeze, but she wills herself, and draws her sword, and gets up at the same time. "I am not afraid of you." She says, more to herself, and she strikes the Yeti.

(If it is just a regular Yeti, she will try to knock it down with her shield) Shield Bash (Athletics): 22

Sword Attack 1: 11 Damage: 11

Sword Attack 2: 14 Damage: 13

(If attacks with advantage. Attack 1: 22, Attack 2: 25)

Perception 29

(its 120 feet to join Kazri in the battle)

The yeti that stands before Kazri is huge, too big for her to shove so she slashes at it with her sword cutting it both time.

Unbeknownst to her, Oli had followed behind her and followed her down the hallway.

Downstairs Chill, every perceptive to what is going on is instantly alerted to the sound of combat above the.  Gorrah and Rekuburk also hear the sound.

Chill and Rekuburk can act this round, Krom and Rhogar can join in the next round as they would be alerted by Gorrah and the others of what is happening

The Yeti screams in rage as Kazri stands unflinching before it at fails to be stunned by its gaze and it again slashes at her with both arms

29 15 slashing damage plus 12  cold damage.

21 14 slashing damage plus 10  cold damage.

Kazri is up

Rnd 2 - Yeti (20), Kazri (39/76), Oli, Chill, Rekuburk, Krom, Rhogar

Rekuberk will rush ahead, dashing to cover 80ft so that he can make it in the next round, using his bonus action to activate his sword, flames appearing along the blade.

"Oli, go and get the others." Kazri is not sure if anyone knows of her situation, so she asks Oli to call for help. In that moment of distraction, she is hit again by the Yeti, but she is able to shield the other attack. With Oli out of danger, she concentrates briefly, and calls upon Helm's blessing to her sword (BA Branding Smite), then strikes the monster again.

Sword Attack 1: 17 Damage: 9

Sword Attack 1: 17 Damage: 13

(If hit, the attack deals extra 6 radiant damage.)

Chill immediately sets off as fast as he can using his Cunning Action and Feline agilty until the battle is in sight. He'll then stop and fire his crossbow at whatever foe he sees.

Attack: 28 Damage: 36

Can't see the rolls, but the red means one of them was 1 so I'll use the Piercer feat to reroll the damage 10

Oli makes halfway to the others when he sees Chill and Rekuberk right behind him. He does a low growl and hops a couple of times. He turns around and goes to Kazri. (Since the Yeti is huge, he’s just going to hang back for this fight.)

Kazri focuses her attention on the Yeti and again strikes both times as Oli turns to find the others only to find Chill and Rekuburk coming up the hallway.  The half-orc is fast, but not as fast as the tabaxi who gets into sight and snaps off a shot with his crossbow striking the yeti. 

The yeti keeps up his assault on the shield maiden as it bellows in pain.

23 14 slashing damage plus 11  cold damage.

16 14 slashing damage plus 6  cold damage.

Again Kazri is able to block one blow with her shield while the claws of the creature rake her arm.

Kazri is up

Rnd 3 - Yeti (80), Kazri (26/76), Oli, Chill, Rekuburk, Krom, Rhogar

Kazri thinks that she has finally met her match, and she feels every strike that goes through her defenses. She brings her shield close to her, and she touches herself with her fingers. (I am not sure if one has to drop his/her shield/weapon.) She heals herself (Lay on Hands heals 40HP).

Chill takes Steady Aim (BA) and fires again.

 Attack: 26 Damage: 18

I'll reroll that damage per the Piercer feat 23

Seeing his chance to get into the fight, Rekuberk rushes ahead to end just in front of the yeti. With a growl he lets his orc blood take over, entering into a rage as he sees the blood flowing from his companion. With a growl he slashes towards the yeti twice, leaving caution to the wind as he does so.

Attack: 12 Damage: 16

Fire Damage: 9

Attack: 18 Damage: 11

Fire Damage: 10

(And forgot to roll advantage for Reckless Attack so here those rolls are.)

First Attack: 26

Second Attack: 17

Rekuberk's growl shakes Krom from his torpor-like state, "Moradin!" shouts the dwarf as he rushes towards the sound of battle.

(25ft movement towards the yeti and dash action to move 25ft again)

Rhogar not only double times it to keep up with the dwarf, but soon enough vanished in a swirl of golden mist, only to reappear that much further ahead of the dwarf in his desperate rush upstairs to join Kazri's side. Though by then, Gorrah had a good enough head start to hover near the paladin from on high, seeming to try focus her efforts in sizing up the beast and lining up attack angles.

Movement/Action: Move and Dash for 60ft.

Bonus Action: Cast (2nd level)Celestial Step another 30ft.

Kazri faces the creature one on one and is hard pressed by the relentless assaults of the Yeti. Her hope is bolstered by the crossbow bolt that slams into the yeti.  She didn't have time to glance behind her but only Chill could deliver such a well placed shot.  She took a moment to heal herself as another bolt strikes the yeti.  More help followed as a raging half-orc suddenly came up beside her, a flaming sword held in both hands as Rekuburk hacked and slashed at the yeti.  The flaming sword cut deeply and the yeti fell to the ground, dead.

Krom is just coming up the stairs and Rhogar suddenly appears next to Chill to witness the the last gasps of life from the yeti that now lays dead in the doorway of the fortress.

Chill rushes forward his crossbow up ready to fire again as he steps into the doorway and looks for more trouble.

Perception 11

If nothing is seen

"Rekuburk, can you drag this body away from the door so we can close it again?