Gyaan first blast of eldritch energy hits Dark and his second blast hits Repressed. 

The combination of Passoveloce’s arrows and Seraph’s eldritch blasts is sufficient to drop the leader of the cultists who drops to the ground clutching his chest and saying weakly “remember me!”. As their leader goes down Seraph (24) and Gyaan (14) find themselves dodging giant flying eyeballs - Seraph (Attack: 18 Damage: 6) and Gyaan (Attack: 15 Damage: 5).

A robed figure then steps through a door on the far wall (west) and looks at the fallen leader before saying “thank you that is going to save me a problem later on but it really can’t be tolerated!” as a blast of icy air sprays forth from his hands. Every one in the party - including those not in the room -  takes 34 of cold damage (DC14 - Con for half damage)

Gyaan’s save (DC 14 - Con) = 4

Vidar looks around as he hears the sound of running feet to spot Anardil running towards him saying “… sorry I’m late what did I miss?” just as the blast of cold air hits them both.

Vidar and Anardil - you’re up but you can’t get into the room as Lucas and Gyaan are in front of you and Gyaan is in the doorway.

Passoveloce's saving throw (DC14 - Con): 7

"Brrrr, that's cold" says Passoveloce

( Anardil CON save: 23 17 HP taken as cold damage )

Feeling the bitter cold of the spell Anardil tries to look over his companions shoulders, but the chaos of the fight make it impossible.

"What's going on there? is that a white dragon attacking us?" she asks to the others, her weapons at the ready but not really able to do anything useful.

Anardil can’t see the spell caster

DC14 - Con  23 (rolled adv if that attack was from a spell)

Anardil is standing in a 5 foot wide passageway behind a very large Goliath who is standing behind a human who is standing behind a tall (6 foot plus) Dragonborn. She cannot see into the room and doesn’t know if it was even a spell - it could have been the breath of a White Dragon or similar!

((Anardil's turn retconned then hehe )) 

Lucas - you’re up!

(OOC: Sorry, just now noticing the Con Save was for everyone. Also not sure if Lucas' original readied action would've been applicable after the door was opened, but presuming not given room description and positioning. So, deducting spellslot for wasted magic missiles. Nor will he attempt a counterspell for like reason.. much to his chagrin)

(Also... it looks to still be Vidar and Anardil's turn as they haven't taken any actual actions. But, I'll go ahead and throw out Lucas' actions for the turn)

-Con Save(DC 14): 21. 

If Lucas was yet able to hear the leader's final words, then he cannot help but look to the ground mutter "What the fu--who the heck says remember me as their final words?" Even if not blessed by such insights the words likely would've been caught off with a cry of pain and curse from the hooman from the freezing blast. "Gosh darning it ya old codger! Least ya could'a done was closed the door or shielded us from that!" Lucas complained, though let out a pained chuckle towards the end of the spiel. The weaving a verbal charm saw the wizard standing a little more at ease before hunching down and calling out, "Now if ya don't mind, Mr. G. Clear the bloody path, gosh darnit!"

Bonus Action: Cast (1st level)Healing Word on self, restoring 8 Hp.

Action: Ready to Dash into the room and down to the base of the stairs once Gyaan is out of the way.

(OOC - still not able to get discord to work properly so will have to go with Theatre of the Mind. My understanding of the party positions are as follows: Passoveloce is 20 feet away from the door and 5 feet below, Seraph is 5 feet down the steps - approximately 7-10 feet from the door, Gyaan is on the platform  5 feet from the door, Lucas is in the doorway, Vidar is 5 feet behind him and Anardil a further 10 feet from Lucas

Another figure steps into the room from the door in the west wall. Seeing Passoveloce shivering with cold she says in a sneering tone “cold little one perhaps I can help with that!” as she moves hers hands in a different set of movements to those practiced by the first figure and calls out a command in a harsher tone. A single red spot flies from her hands towards the doorway just above Gyaan’s ear where it suddenly explodes into a ball of flame 33. All party members pls make a Dexterity saving throw.

A finger suddenly appears in front of Seraph’s chest and starts poking him Attack: 10 Damage: 7. Can Seraph also pls make a Wisdom Saving throw.

Party Saving throws required:
Dexterity - everybody
Constitution - Vidar
Wisdom - Seraph

Passoveloce you’re up!

(ooc: Pfft. Well, Lucas is about to go down to AoEs at this point. xD Also assume he again can't quite see past Gyaan enough to even attempt to counterspell the fireball. C'est la vie.)

-Dex Save(DC ??): 18. 

DC 14 (Dex) was required so half damage for Lucas. What’s AoEs?

Passoveloce recognises the red dot and quickly takes evasive action Dex-DC14 save: 18 

Half damage - 16 HP for Passoveloce

Successfully dodging the exploding fireball and taking no damage, Passoveloce calls out to Gyaan and the other fighters, "Come on big fella, get down here and slice up these soft and squishy beings, they don't even have hard shells" . He then commits his full attention to the spellcasters.

"Thanks for warming me up Honey, but it'll take more than that to fry this package". He then focusses intently on the Robed figure with the cold hands.  Firing two arrows in his direction.

Bonus action: [Tooltip Not Found] 

Attack: 15 Damage: 6 (if that is a hit, extra damage from [Tooltip Not Found]: 5)

Attack: 26 Damage: 7 (If the previous attack hit, then extra to hit roll for advantage: 20)

Because of shared initiative same rule as before applies:
1-3 Hidden goes first
4-6 Passoveloce goes first

Simultanteous initiative role = 2

As Passoveloce nocks an arrow and draws back his bow (DC 11-Wis) 14 {23 rolled} and is able to easily get the shot away. He is however dancing around trying to avoid the spectral finger that keeps trying to poke him in the eye Attack: 12 Damage: 11

Seraph - you;re up followed by Gyaan

(OOC to clarify: the first tooltip - bonus action - was Steady Aim, the second - extra damage - was sneak attack). The extra 'to hit' roll was because if the first attack hit then I also had advantage on the 2nd attack, if the first attack missed, I didn't. As 20 < 26 it can be ignored.)