Realizing the door is stuck, perhaps due to ice on the inside if the cold is anything to go by, Yarina braces herself and attempts to force the door open.

Athletics: 17 + 1 guidance= 18

Yarina,

Putting your shoulder to the door is enough to cause the door to give way. Instantly a blast of frigid air enters the corridor. Through the threshold you see a 15'x15' room covered in ice. The center of the room has a pedestal. A skull that resembles the skulls found in the main room of the temple floats barely an inch above it and appears to be made of ice. Three shards of ice cling to the ceiling like icicles just behind the pedestal. Two dwarves dressed in robes are frozen solid in a pose suggesting they were running for the exit. A look of horror frozen on their faces. A large gaping hole in the stonework lies on far wall to the East, large enough for a person to fit through. Your torch snuffs out as the blast of air flows past you.

Eldrin,

The skull glows to your eyes and gives off an aura of conjuration magic as you glance at it.

Zephyros,

Your torch is snuffed out as a blast of frigid air rushes past you.

Everyone,

Please make a constitution saving throw. The light from Meira's lantern flickers briefly but remains lit, providing the group enough light to see in the dark temple. 

Yarina con save: 6

Lyra CON save: 20

Eldrin steps up beside Yarina, the breath catching in his lungs as the icy wind knifes through his cloak

"Hold," he murmurs. His gaze falls upon the floating skull, a subtle glow blooms in his vision, a distinct aura of conjuration.

“The skull, it pulses with conjuration magic."

The cold hits him like a wall, unnatural, his hand grips the edge of the stone doorway as a shudder racks his frame. He closes his eyes for a heartbeat, trying to force his body to resist whatever unnatural chill seeps into his bones.

Con save:9

(Meira CON Save: 2) 

The armored warrior grits his teeth as the blast of icy air hits him (Con save: 16). Zephyros, remembering from past experience, evil need be dealt with swiftly and decisively, throws his trident at the floating skull. He turns to Eldrin, "No time for debate. This evil must be abolished."

Attack: 22

Damage: 10

Yarina,

The blast of frigid air catches you off guard and your armor freezes over instantly. Fortunately, you're accustom to cold environments and as such take no damage from the blast.

Meira,

As the lantern light flickers, the handle to the lantern ices over instantly and seeps into your fingers as it does. You take 1 point of cold damage.

Zephyros,

Your trident flies over Yarina's shoulder and through the ice skull, shattering it in the process. It continues past the skull, sinking into the center icicle behind the pedestal.

Eldrin,

As the trident destroys the ice skull, a wave of magic explodes from it before quickly dissipating. You detect no residual magic from the shards.

Everyone,

As the trident sinks into the icicle behind the pedestal, you see wings unfurl from it. Then the icicles to the North and South begin to move as well. 

Combat Begins: Round One Initiative

• Eldrin 23
• Yarina 21
• Zephyros 16
• Lyra 14
• Ice Mephit A 11
• Gareth 10
• Ice Mephit C 10
• Meira 9
• Ice Mephit B 8

Eldrin flinches instinctively as the wave of magic ripples outward from the shattered skull, arcane static prickling across his skin, the cold momentarily forgotten in the echo of released power.

He turns his head just enough to meet Zephyros’s gaze as the trident quivers in place.

“Decisive indeed,” he says coolly, a faint smirk tugging at the corner of his mouth despite the tension. “A lesson not to linger when you call something evil.”

But already his gaze begins to shif, locking on the icicles as they twist and unfurl, no longer shards of inert ice but living things.

With a fluid motion, Eldrin lifts his hand. The air around him distorts subtly as he draws a thread from the Weave, spinning fire into form with practiced grace.

A searing bolt of flame streaks toward the nearest creature, a firebolt arcing through the freezing mist.

Action Cast Fire Bolt 13 to Hit; 2 fire damage [Ice Mephit A]

CON save - 4 :(

As they approach the door, the cold gets deeper. Shivering, Gareth pulls his cloak more tightly around himself. He waits while Yarina is able to brute force the door open. There's another skull, this one seemingly made of ice, on the other side and two dwarves frozen in place, their faces masks of horror. Gareth grimaces and braces himself for an attack, unslinging his bow, even as Zephyros throws his trident at the skull. The icicles begin to sprout wings, and Gareth concentrates on one, unleashing an arrow at its center mass.

Action: Longbow shot at Ice Mephit A - 10 to hit, 11 piercing damage plus 5 damage from Hunter's Mark

Bonus: Hunter's Mark against Ice Mephit A

Yarina charges into the room and swings her greatsword at mephit C with a roar.

Action: greatsword to hit 23, damage 12

Lyra stops jumping, watching with her mouth agape as Zephyros strikes down the ice skull in a single blow. "That is what I call a direct approach!" she exclaims, grinning—though not for long, as she notices the three icy figures threatening them. Shifting slightly to find a clear angle for her spell, the trickery cleric points at the one in the center, and a familiar thin ray of radiance shoots toward it.

Holy Word To Hit: 9 / Damage: 6

 Combat continues: Round one initiative

• Eldrin 23
  Your mote of fire follows Zephyros' trident into the center icicle as its wings begin to unfurl. It's hard to tell from this distance, but you think your fire magic was more effective at damaging this foe.
• Yarina 21
  Your greatsword slashes through this ice creature with great effect. As it begins to move, you cut a large chunk of ice off that falls to the ground at your feet.
• Zephyros 16
  Botting: After throwing your trident, you move forward, shield at the ready. You reach for your trident but have to fight the creature for control over it. [[Contested strength test: 20 vs 16, you win]] You take your trident back and get ready to thrust it into the creature again.
• Lyra 14
  Trying to shoot through all the tall people proves too difficult. Your aim misses its mark, and your radiant bolt hits harmlessly against the back wall, melting some of the ice covering it.
• Ice Mephit A 11
  The creature lets go of the trident as its ripped from its tiny hands attached to its wings. It opens its mouth and lets out a breath of icy death aimed at Zephyros and Yarina. Both of you, please make a constitution saving throw DC 10 or take 9 cold damage, half on a successful save.
• Gareth 10
  [[Welcome back]] You take 1 point of cold damage as the door opens. You peek down the hall and magically mark your target. However, you rush your shot, and it deflects off the hallway wall, coming precariously close to hitting your ally Zephyros before striking the far wall.
• Ice Mephit C 10
  The creature flails backward at Yarina's assault. It opens its mouth in response and lets out a breath of icy death aimed at Yarina and Zephyros. Both of you, please make a constitution saving throw DC 10 or take 7 cold damage, half on a successful save.
• Meira 9
• Ice Mephit B 8
  The icy creature slashes with clawed hands at Zephyros. Attack 21 Damage 4 slashing + 3 cold.

Meira is up!

Combat continues, Round two initiative

• Eldrin 23
• Yarina 21
• Zephyros 16
• Lyra 14
• Ice Mephit A 11
• Gareth 10
• Ice Mephit C 10
• Meira 9
• Ice Mephit B 8

Yarina con save 1: 6, 9 damage halved to 4 from resistance

Con save 2: 4, 7 damage halved to 3 from resistance 

Gareth winces as he witnesses the mephits unleash their icy breath at Yarina and Zephyros. Frustrated that his first shot missed the mark, he takes careful aim at the same mephit as before.

Longbow Attack - 13 to hit, 7 piercing damage + 1 Hunter's Mark damage

"Hey, that is terribly uncool of you!" Lyra shouts at the mephits attacking Zephiros and Yarina. She pauses, frowns, and waggles a finger at Ice Mephit A. "I mean ... well... you know what I mean. Anyway, die already!”

Action: Holy Word To Hit: 7. Ughhh :( 

Bonus Action: Healing Word on Yarina for 9 HP.

Eldrin watches intently as the firebolt connects, the flare of flame licking across the icy creature's surface. A crack spreads through the crystalline form, a hiss of steam rising where fire met frost. He tilts his head, expression sharpening, not in surprise, but in confirmation.

"Ah," he breathes, almost to himself. "Fire it is."

The fingers of his free hand flex briefly, warming despite the chill creeping into his bones. With deliberate calm, he steps a half-pace forward, planting his stance.

Raising his hand again, Eldrin draws on the Weave with greater purpose this time, the air around him distorting with heat as flame coils into being.

With a flick and whispered command, another firebolt arcs forth, trailing embers in its wake as it speeds toward the icy foe.

Eldrin’s voice cuts through the cold like steel:

“Burn, and be done.”

Action Cast Fire Bolt 22 to Hit; 3 fire damage [Ice Mephit A]

Yarina feels her strength starting to wane, but gives a breath of relief as Lyra's healing spell takes effect. She attacks the mephit before her with renewed vigor.

Action: greatsword to hit (on mephit C if she can get to it without triggering an AoO) 22, damage 15

Still shivering a little from the blast of cold, Meira sets down her lantern and pulls out her bow. Trying to stay focused, she fires at Mephit A.

(Shortbow Attack: 12, Damage: 7 piercing + 6 sneak attack)