(Um actually, Reign of Winter came out six months before Frozen and was being planned out as far back as 2008, so if anything Elsa is impersonating Nazhena)

Wisdom:14

All that research only to fail the save.

Jirel sentinels against the Golem

Attack: 16 Damage: 19

And then Recklessly attacks it

Attack: 21 Damage: 11

Attack: 23 Damage: 12

Nazhena(28)(2),Rose(19),Zaf(18),Jirel(11),Jasun(8),Nadya(7),IceSprit(8)(36),IceGolem(5)(48),Seraphina(1)

The Ice Spirit attacks Rose and Nadya

Attack: 19 Damage: 13

On Nadya

Attack: 14 Damage: 13

The Ice Golem attacks Jirel

Attack: 25 Damage: 13

Nazhena(28)(2),Rose(19),Zaf(18),Jirel(11),Jasun(8),Nadya(7),IceSprit(8)(36),IceGolem(5)(48),Seraphina(1)

Sera attacks the golem.

Attack: 28 Damage: 16

Attack: 25 Damage: 14

Nazhena(28)(2),Rose(19),Zaf(18),Jirel(11),Jasun(8),Nadya(7),IceSprit(8)(36),IceGolem(5)(48),Seraphina(1)

Nazhena casts Sleet Storm on all of you. The area around you all becomes difficult terrain and is heavily obscured. You will also have to make a DC16 Dexterity Saving Throw at the start of each of your turn to avoid falling prone. You can't see what Nazhena does next.

Nazhena(28)(2),Rose(19),Zaf(18),Jirel(11),Jasun(8),Nadya(7),IceSprit(8)(36),IceGolem(5)(48),Seraphina(1)

M-maybe Sexy Dexy? 4

Not Sexy at all!

Rose falls onto her tushy with a surprised squeak escaping past her throat. The firbolg is unable to see, trying to get back up doing her staff as some sort of a crutch, all while casting Bless on Sera, Jasun, and Jirel!

Jasun:24

Jirel:18

Nadya:14

Nadya falls on her bountiful ass. Jasun and Jirel do not. 

Jasun will double move to get out of the storm, Jirel will recklessly attack the Ice Spirit.

Attack: 24 Damage: 12

Attack: 10 Damage: 12

Nadya gets up and starts moving out of the sleet.

Nazhena(28)(2),Rose(19),Zaf(18),Jirel(11),Jasun(8),Nadya(7),IceSprit(8)(19),IceGolem(5)(48),Seraphina(1)

Dex Save(DC 16): 22.

"Not the best weather for a flight, but I'm going up! Sera! Hang in there!" On the back one last word of encouragement and healing, Zaf takes to the air and flies after where he last saw Nazhena, intending on getting within range of cutting her down. Though failing that from her being further than expected, he'll give chase!

Bonus Action: Cast (2nd level)Healing Word, restoring 11 HP to Seraphina and Chalice Healing 6 to self.

Movement: Fly after Nazhena(up to 50ft).

Action(if possible): Scimitar Strike!
Attack: 10 Damage: 8 non-magical slashing.

Zaf: Even with your dashing, Nazhena is still 40 feet away from you.

Nazhena(28)(2),Rose(19),Zaf(18),Jirel(11),Jasun(8),Nadya(7),IceSpirit(8)(19),IceGolem(5)(48),Seraphina(1)

The spirit attacks Jirel and Rose!

Attack: 11 Damage: 12

Rose

Attack: 11 Damage: 16

The Golem attacks Seraphina

Attack: 15 Damage: 16

Nazhena(28)(2),Rose(19),Zaf(18),Jirel(11),Jasun(8),Nadya(7),IceSpirit(8)(19),IceGolem(5)(48),Seraphina(1)

Sera goes for the ice golem.

Attack: 24 Damage: 20

Attack: 22 Damage: 18

Add 2 to that second attack because Rose is the best.

Nazhena(28)(2),Rose(19),Zaf(18),Jirel(11),Jasun(8),Nadya(7),IceSprit(8)(19),IceGolem(5)(12),Seraphina(1)

Nazhena dashes and flies another 120 feet away. It's pretty clear that the Jadwiga magic that she's using to fly will allow her to easily outpace you.

Nazhena(28)(2),Rose(19),Zaf(18),Jirel(11),Jasun(8),Nadya(7),IceSprit(8)(19),IceGolem(5)(12),Seraphina(1)

Jasun tries to finish off the Ice Golem:

Attack: 21 Damage: 13
Attack: 16 Damage: 6

Zaf's not one to give up. Not  with prey so close in hand. Not with her 'enemy' right within her talons! "Noone troubles her, and escapes scott free." A more feminine voice slips past the Aaracokra's beak as their eyes fully turned an ice blue. "Noone." She flew closer, eating up the distance in seconds far faster than they've ever run on land. It alone would not be enough. Not without focusing inwardly, and drawing from the wellspring.

But, it was close enough. She drew her star map once more. Its it rolled up form, it would better endure the high altitude movement. Yet she would slow all the same, slow her breathing, and like a sniper to their rifle, took a few precious seconds to line up one scroll end before firing a dazzling beam of starlight and destruction. 

Movement(Fly): 50ft closer to enemy.

Action: Cast from Star Map (1st level)Star Bolt at Nazhena.
Attack: 12 Damage: 16 Radiant.

Nazhena is easily able to outpace Zaf and fly away from the battle. With your numbers advantage, you're easily able to defeat her now leaderless minions and enter the gate. Upon approaching the hut, its' shackles break and the hut stands upon its' chicken legs and lets out a triumphant cry.

"BAWK BAWK BA-KAWWWWWWWWK!"

Then it sits back down and allows you to enter.

Area N1

The first thing you notice is that the interior of the Dancing Hut is far larger than the outside of the hut. Bundles of dried herbs hang from the rafters of this comfortable-looking room, and along the walls are numerous shelves holding a bewildering variety of glass jars, bottles, and vials containing all manner of strange magical components and alchemical ingredients. A massive cauldron sits in the middle of the room. No fire burns under the pot, but the liquid within it bubbles and churns, and white fumes rise and lap over the brim. A large stove, writing desk, bookcase, and fireplace complete the room, along with a number of crates, barrels, and sacks. A short flight of steps leads up to a set of double doors in the north wall, and a small ladder climbs to a trap door in the ceiling in the northeast corner. Two windows flank a door to the south.

Make a Perception check.

Rose is a bit hesitant to enter the hut at first, but her curiosity is her downfall as she enters first, taking a good look around their surroundings. 

Percep: 14 

“Hoo boy.“ Jasun said. “This looks interesting.”

7 oops, +5

Zaf is not hesitant about entering the Hut in the least. In fact, he seemed almost drawn inside, the blues of his eyes having turned more glassy along the way. Further still did he wonder to the cauldron itself as phantom images made of snow flurries walked beside him. Two figures, one clearly avian by the wings and slumped forward as if injured, and the other more elven and carrying the former, eventually overtook Zaf entirely by at least a step, prompting him to stop and watch.

Beside the cauldron there was another figure, stooped somewhat, but beyond it and their large size they were too indistinct to make out more. By the gesturing between the elf and great figure, some heated conversation was held in silence. An agreement is yet struck, for the elven figure then reached out as if to offer a free hand.

A motion Zaf had started to mirror, before the flurries sudden disappation and evaporation snapped them out of the vision. For a vision it was, as all others only saw them stop short about 15 feet of the cauldron, stare at it a while, and then start to reach their hand out, only to snatch it back and hold it to their chest. The more perceptive, on the other hand, might've caught glimpses of the figures. Though, they could just as well be a trick of the light and incoming breezes from the outside.

In any case,  Zaf did looka round after the fact, looking wary.

Perception: 20.

Jasun notices that there's a small symbol on one of the bricks in the fireplace. While you're all examining the room, you also notice a hunched, old crone with a long bird’s beak, donkey ears, horns, and stringy black hair. She wears a peasant’s dress with a red shawl tied tightly around her wizened head, but these articles do not disguise her clawed hands or the scaly bird talons that are her feet. "By what rights are you traipsing about my home?" She squawks.

Sera backs into the door and clamps her mouth shut, electing to not say a word until she knows exactly who this woman is.

Jirel will take a deep breath. She’d harden, holding her chin high. The barbarian will step forward to face the old crone to stand almost protectively in front of Rose and Sera. “We took the squawking invite.” She’d grunt, hands gripping her axe at the ready, muscles flexing in response. 

"What invite?"