Mr. Fists will move to the space South East of Sunshine and fire a dart at frog No. 2

Attack: 9 Damage: 7

Nalla will hold her attack until they come into her line of sight, letting a Firebolt go toward one of the frogs. 

Firebolt: Attack: 11 Damage: 5

Mr. Fists, you run across the ladder as carefully as you can while moving at full speed.  Make an Acrobatics check to avoid falling into the water.

Mr. Fists Acrobatics - 6

The kenku speeds across the ladder; it wobbles slightly, but Mr. Fists leaps the last five metres and sprints on, readying his dart as he goes, and launching it into the darkness.

(As kenku lack darkvision and the torch is too far, the attack is made at disadvantage, so I will roll the other die:  11)

There's the sound of the dart impacting something fleshy, so you hope that it hit.

Two elves run up, scimitars drawn, cold killing expressions on their faces.  Elf 1 attacks Sunshine:

Attack: 23 Damage: 9

That's a vicious attack, slicing down, right into Sunshine's side and knocking the strength out of her.  Sunshine drops into the shallow water of the pool, unconscious and bleeding out, blood starting to redden the water already.

Elf 2 attacks Mr. Fists:

Attack: 12 Damage: 4

But the kenku dodges out of the way.

Ice Frog 2 is hopping towards the north side of the pool, seemingly to attack the two there.  Nalla's Fire Bolt triggers, and the frog is no more; it burns intensely for only a moment before the corpse is extinguished by the cold and the water.

Sunshine is up.  Unless you had a reaction or feature to save you from that attack, make a death saving throw.

Death Saving Throw #1: 11

That's one success for Sunshine.

The next ice frog jumps around Mr. Fists, onto the ladder, and bites at Telias:

Attack: 15 Damage: 3

But it's not as sure-footed on the ladder as it hoped perhaps, and misses.

Verdan and Telias are up.

Trying to clear his head, Verdan again levels his shortbow to the nearest frog, sending an arrow in its direction.

Attack: 25 Damage: 8

He then turns to Sunshine,

"Your times not up, you're not yet gone
Rise again like the brilliant dawn."

Healing Word on Sunshine for 5 points of healing.

Telias draws a hand across his chest and the small arch on his staff glows before green strands wrap around the elves and the frog. Bane 

(DC12 CHA save)

Sunshine, you waken with 6 HP.

Verdan, your bolt hits the frog, stabbing through its back, but it's still up.

Elf 1 CHA save: 16
Elf 2 CHA save: 2
Frog CHA save:   12

One of the elves glares at  you, unaffected, but it takes root in the other two.  They are baned.

The dwarf, unseen in the darkness, fires a crossbow bolt at Nalla:

Attack: 14 Damage: 2

Nalla, you see the bolt shoot towards you and have time to dodge out of the way - almost.  It grazes you, but you know you got lucky.  You can't see who shot at you, but it's clear there are more enemies than are illuminated by the torch still floating aloft, held by mage hand.

Round Two
Mr. Fists and Nalla
Elf 1 and Elf 2 (baned)
Sunshine (prone)
Frog 1 (baned)
Verdan and Telias
Dwarf

Mr. Fists and Nalla are up.

Mr. Fists is going to attack Elf 1

Shortsword - Attack: 21 Damage: 6

Bonus Action Unarmed Strike - Attack: 7 Damage: 4

Nalla will step forward a bit more and do her best to find whoever it was that grazed her with a shot from a crossbow. If she does not see a likely target she will fire off another Firebolt at Elf 1.

Firebolt: Attack: 9 Damage: 4

Mr. Fists, you stab, and stab well, hurting the elf a lot.  Your second attack misses though - your fist is speeding towards its target when it smashes into a ball of magical fire.  It doesn't hurt, but it does manage to knock both the fire bolt and your fist off course.

Elf 1 and Elf 2 both attack the skilled kenku warrior in front of them, perhaps believing that Sunshine is still unconscious.

Attack: 22 Damage: 7
Attack: 16 Damage: 2

A slice, and a second slice - both connect (I believe), and Mr. Fists is looking really rough, blood dripping through the feathers and onto the icy ground.  Still up though.

Sunshine, you are prone but alive and awake, and you're up next.

With a quiet gasp, Sunshine comes back to consciousness. "Not again," she spits through gritted teeth. She pushes herself to her feet, daggers at the ready, and slashes twice at Elf 1 in front of her.

Attack: 12 Damage: 5

Bonus Action: Attack: 17 Damage: 4

Sneak Attack: 1

Daggers don't-quite-glint in the dim light, but the first dagger slashes out and slices deep, deep into the elf's throat.  Elf 1 drops to the ground dead.  

Second attack redirects to Frog 1:  slice!  and with sneak attack damage, the dagger skewers the poor creature for a moment before the corpse slides off and into the pool.  Ice Frog 1 is dead.

Verdan and Telias are up.

(Correction on the post above - Elf 2 is baned, so her attack on Mr Fists misses.  Mr. Fists still takes the 7 points of damage from Elf 1 though.)

Telias, unable to move closer, just calls down holy vegance upon the remaining elf, a massive bell ringing out. Toll the Dead

DC12 Wis Save or 4 damage

Feeling less than confident firing through his allies in tight quarter, Verdan decides on a slightly different tactic.

"Seems like your ambush has not gone well,
You were betrayed by your rancid smell

Vicious Mockery on the elf (DC13 WIS Save) 5 psychic damage and disadvantage on next attack roll on failure