Kazri acts like she is offended by Sephek's rude dismissal. She forcefully takes a step forward, but not too close to him, and crosses her arms. "Listen, my 'friend', the Frostmaiden herself summoned me here, and I don't believe she did so for no reason. I was on a very important diplomatic mission on her behalf, but luckily for you mister, I wasn't far from here when I received her call to aid you. Now, perhaps my presence was needed because she senses that your devotion to our goddess is wavering?" Kazri looks at Sephek with steely icy eyes. "Give me a name of the one that you last sacrificed in the Frostmaiden's honor? Maybe I can verify that, and I can give a good word on your name. So that you may return to the goddess' good grace again."

"You are a fool," Sephek spits, "and have no idea what you are talking about.  I am no lackey for the Frostmaiden as you claim to be, I have been remade.  Who sent you here?  Certainly not the Frostmaiden.  The family of that fool Dorren, the dwarf in Bryn Shander?  Did they send you to find me, because I killed him?  He cheated her paying off those in charge of the sacrifices.  He deserved to die.  That is the will of Auril.  Accept it and move on."

He raises his sword, which is made of ice.

"Leave now before I kill you also.  Accept the fate of those who try to cheat Auril, accept the fate of the north that will lie forever under her cold rule!"  

"Threatening her was a mistake!!!" Rekuberk roars as he draws the sword from his back, his eyes widening as he lets his rage overtake him, rushing forward and slashing towards the man while stepping on front of Kazri to guard her.

(So if allowed he is going to rage and take his attacks against Sephek. Oh and to be safe they will be reckless!)

Attack 1: Attack: 18 Damage: 15

Attack 2: Attack: 23 Damage: 14

Oh and for forgot the +2 to damage so they should be 17 and 16

Also since I probably started combat here is Inititiative: 16

Initiative - Chill 10, Kazri 13, Krom 21, Rhogar 15, Sephek 17

Order of combat

Krom (59/59), Sephek (?), Rekuburk (81/81), Rhogar (48/48), Kazri (67/67), Chill (45/45)

Only Rekuburk and Kazri can act in the first round as no one else is in the cabin with them and it will take 1 round for the others to realize that fighting has begun inside the cabin.

Sephek senses the imminent attack and while Rekuburk makes his move Sephek launches an attack against Kazri

Attack: 21 Damage: 13 slashing + 5 cold

Attack: 16 Damage: 9 slashing + 5 cold

As Sephek's blade of ice slices across Kazri's unarmored body Rekuburk steps in and sweeps his sword against the man and crushing blows.

Kazri is up, then back to the top of the full order.

Krom (59/59), Sephek (33), Rekuburk (81/81), Rhogar (48/48), Kazri (39/67), Chill (45/45)

(@DM I did not see your other posts, sorry. I have edited my post.)

Kazri goes back to her serious demeanor. “It is much appreciated that you have given us the answers that we were looking for.” She touches the wounds opened by the cold sword. (Lay on Hand 25HP). “Now you shall answer for your crimes.” Kazri stays where she is, and looks at Sephek straight in his eyes.

Krom listens to the exchange of words and clashe of blades between Sephek, Kazri and Rekuberk and decides to intervene.
Warhammer and Shield at the ready, the dwarf charges into the room chanting an hymn of transmutation (Heat Metal) "You seem to handle well the cold, let's see how you handle Moradin's Fire!" shouts Krom to Sephek. The metal buckles and buttons on Sephek's clothes glow red-hot as the dwarf finishes his hymn.

Movement: Inside the cabin, in the square below Kazri

Action: Heat Metal at 3rd level 10 Fire damage (If it doesn't drop or remove the object, in this case, his clothes, it has disadvantage on attack rolls and ability checks until the start of my next turn.)

Krom tries to heat the small metal buckles on his clothing but it is not enough to harm the man or cause him discomfort. 

Sephek grins as you see his wounds partially close up.  "Nice trick lady, perhaps you are blessed." he comments as he slashes at her again

Attack: 11 Damage: 11 slashing + 2 cold

Attack: 13 Damage: 8 slashing + 5 cold

and again he cuts Kazri with both attacks the cold bite not nearly as bad as the cuts.

He is briefly surrounded by silvery mist and then disappears.  He appears outside the house near where Chill is and then starts running south.

Rekuburk is up followed by the rest in order

Krom (59/59), Sephek (28), Rekuburk (81/81), Rhogar (48/48), Kazri (41/67), Chill (45/45)

Rekuberk is going to get as close as he can to the fleeing man, readying one of his javelins once he drops his sword to the snow. As before this attack will be reckless.

Javelin: Attack: 15 Damage: 13

Javelin: Attack: 24 Damage: 10

(@Pal54 & Wolfly: This probably got lost in the shuffle, but Neither of those last 2 attacks hit as Kazri & Krom currently have Mage Armor cast on them. So, Kazri's AC is currently 14.)

"I see the festivities are already in full swing. Time to join in, I think." Rhogar strides forth as much as he can to see around the house. Once he has eyes on Sephek, any gloom having no effect on the blessed eyes of the Dragonborn, "Vixix' Eye" is swung about over head in a circular pattern until the tip began to glow a faint orange. "Yet he who would snuff out the light of life know the wrath of the sun!"

In a sharp, slashing motion, an orb of golden flame appears swirling into existence, and soon trying to ram itself into Sephek's front.

Movement: Full 30ft closer to Sephek.

Action: Cast (2nd level)Sun's Wrath using warlock slot as close to Sephek as possible(60ft range).

Bonus Action: Move &  Ram Sun's Wrath from the south of him. Dex Save(DC 15) to take 1/2 of 6 Fire Damage.

((I remember that now.  I also remember thinking that I would never remember it when the time came.))

Rekuburk rushes out the door and quickly gets eyes on the fleeing Sephek.  He then launches two javelins at the man as he tries to escape.  Both hit the man and he stumbles for a moment but keeps moving.

A moment later Rhogar has started to come around the side of the cabin and also sees the man fleeing south.  Conjuring a sphere of fire he slams it into the man. Dex save 20

Sephek is able to nimbly dodge the sphere yet still still finds himself singed by the heat.

Kazri is up followed by Chill

Krom (59/59), Sephek (54), Rekuburk (81/81), Rhogar (48/48), Kazri (64/67), Chill (45/45)

(Can Kazri Misty Step + walk 30 ft towards Sephek, then use Nature's Wrath?)

(Nature's Wrath - As an action, you can cause spectral vines to spring up and reach for a creature within 10 ft. of you that you can see. The creature must succeed on a STR or DEX saving throw (its choice, DC 14) or be restrained. It can repeat the saving throw at the end of each of its turns, freeing itself (the vines disappear) on success.)

Chill waits outside,  hiding in the shadows at the edge of the porch

Stealth 20

When the fighting begins he considers following Krom inside when Sephek suddenly appears outside with Rekuburk hot on his heels.   The sphere of fire is clearly the work of Rhogar.   This is best anyways,  Chill would prefer a fight, or a hunt, outside.  Seeing him try to escape he lines up a shot.

Crossbow Attack: 27 Damage: 24

Kazri sees where Sephek appears and using the same magic transports herself out of the cabin and move forward calling forth spectral vines to keep Sephek from escaping.

Dex save 6

Again he shows his ability to evade trouble by staying just out of reach of the vines.  A moment later though and his flight, and crimes, come to an end as a bolt from Chill's crossbow catches him between the shoulder blades and ends his life.  He falls to the ground the ice blade falling and laying next to his body.

"Great shot Chill!" says Krom as the tabaxi's bolt ends Sephek's life. As the dwarf walks towards the corpse he asks to the rest of the group "Shall we interrogate him now? As I was saying a few days ago, I know an hymn that will allow us to ask him five questions. He may not answer truthfully, but I think that we should try anyway."
While he waits for an answer from the rest of the group, Krom will examine, without touching it, the ice blade.

“Agreed. We should bring the body back to the cabin, so we may have some privacy.” Kazri walks to the body, and will carry it back.

 Seeing the man fall, Rhogar smoothly sweeps his claws off to the side, sending the mass of fire off to the side and into an empty patch of snow... for the time being. Though too far to see the man's regenerative abilities, the Dragonborn remain on edge, if only out of pure wariness. "A fine enough plan, Master Krom. Ms. Kazri... Uh... we should also check on the fellow he came for as well. I heard not exactly what transpired before, but I fear he may have 'completed' his task at some point." He mentions after closing enough distance to speak comfortably with the group.

Also, upon seeing Kazri pick up the body without issue, it is then the flaming sphere gets snuffed before it can burn away enough snow to reach the frozen roots of any trees.