As the dead dino rears to strike, Tuuli reacts instinctively, gathering a microburst of wind to buffet the creature and push the attack off its line.

Reaction: cast Shield with her last spell slot, rendering her AC 19 until the start of her next turn. Phew!

"Oh dear" Pax says and the magic laced words float over the dino skeletons, hopefully making them a litle less effective. He then backs up as far as he can.

ACTION - Casting Bane on the two Dinos. DC15 CHA saves or be baned.
MOVE - 30ft west.

Tuuli jukes and stumbles away from the dinos, backing up behind the other party members. When she’s far enough away, she turns, raising her crossbow and shooting the one Bendrak is fighting.

Bonus Action: Cunning Action to Disengage
Move: straight west 30’, accounting for moving through friendly spaces and whatnot, as far away as she can get
Action: shoot Bendrak’s dino with light crossbow, and Sneak Damage for Bendrak being within 5’, in game log

15 to hit for 15 piercing damage

Reaction: already expended this round for Shield, and thank the spirits

Aranor moves into melee range with the southern dino skeleton. He's secretly pleased that he now has something he can actually hit with his sword. With a grim smile, he swings at the dinosaur.

IGL - Nat 20 (25) to hit for 10 dmg

Walt spins to his right and gets eyes on the attackers. His archer constellation flickers and comes to life and Walt fills the cavern with a luminous radiant glow. Walt throws the conjured flame in his hand and follows that up by a radiant arrow strike from the archer. Walt then turns and runs to the west end of the chamber and braces himself for the fight.

(OOC: Walt will attack the northern dino IF its still 'alive', otherwise he will direct his attacks at the southern one.)

Action: Ranged spell attack with the flame conjured earlier. To hit: 19 for 7 fire damage.

Bonus Action: Activate the archer constellation and make a ranged spell attack: To hit: 7 for 5 radiant damage.

Move: Run 30 ft to the west, ending with his back up against the cavern wall facing the attackers.

Pax imbues an arcane curse upon the two undead carnivores, and then retreats toward the far end of the room. DC15 CHA saves vs. Bane: 14, 9 

Tuuli, protected by her magic shield, backs up and loosens an arrow at the northern dinosaur skeleton, shattering several of its ribs. It's looking pretty shattered.

Aranor moves in, and cracks the skull of the southern dino with a mighty blow.

Walt goes starry, and backs up. Lobbing a handful of flames at the northern dino, he launches a luminous arrow, but misses. 

-- Top of the Round! --

Zartan, Bendrak, and Lucky are up next.

Lucky crouches behind the altar, trying to make himself small, still within melee range of the southern dino.

Zartan Bonus Action casts Dragon's Breath on himself (cold) and blows a freezing cone onto the dragons. 

Action: Attack with Dragon's Breath (both but if not then the south most Dragon Skelton) with Cold Breath - DEX 14 Save or take 10 cold damage. Save for half. 

Bendrak presses forward, trying to stay under the dino's teeth and claws as he swings his axe like he's felling mighty skeletal trees.

Attack: 20 Damage: 10

Action Surge: His momentum carries him on, trying to finish off the first creature, or moving onto the second if he already has.

Attack: 22 Damage: 14

Zartan moves east and finds a spot he can blast a cone of ice-cold arcana upon both dinosaur skeletons. They jump and dodge. DC14 Baned Dex Saves: 7 and 12.

Bendrak lays into the northern skeleton, connecting with his first swing. It still stands, albeit in very bad shape. 

They continue their (baned but brutal) assault:

Dino 1 vs Bendrak: Bite Attack: 4. Hit: 8 piercing damage.
Dino 2 vs Aranor: Bite Attack: 13. Hit: 6 piercing damage.

Pax, Tuuli, Walt, and Aranor are up next! 

Aranor staggers backward from the force of the dinosaur's attack. He almost drops to a knee but manages to remain standing, but it's clear from the blood oozing from underneath his armor that the dino's bite did quite a bit of damage. Still, he manages to bring his sword up for another slashing attack at the skeleton.

IGL: 12 to hit for 9 dmg

Tuuli, now at a safe distance, whirls around, fitting. bolt to her crossbow and lifting it to sight along its length at the dino savaging Aranor. She breathes, and looses, a wisp of air guiding the bolt.

Move and BA: for Steady Aim
Action: shoot Aranor's dino (dino 2) with Steady Aim and thus Advantage and thus Sneak Damage, in game log:

18 to hit, for 21 piercing damage

Reaction: reserved for... welp, no spell slots, so nothing!

Pax calls down radiant flame on whichever dino still standing is the most damaged.

ACTION: Cast Sacred Flame. DC15 Dex Save or take 3 radiant damage.
MOVE AND BA: None

Aranor, badly torn up by the bony undead horror, tries to strike back, but his blade shears off the hard plates of its skeletal form.

Tuuli carefully takes aim at the beast. Her well-aimed bolt shatters much of its skull and devastates parts of its upper skeleton, but still does not quite stop it. (It's now in very bad shape, like its bony comrade.)

Pax pulls down a radiant flame bath upon the northern animated skeleton. DC15 (Baned) Dex Save: 18

Both skeletons are incomplete, as many of their bones are sheared off in splinters on the mine floor, but nevertheless they continue their assault.

Walt is up next, followed by Zartan, Bendrak, and Lucky.

Lucky cannot attack on his own, and Tuuli keeps shooting instead of sending spells through her familiar, so he remains crouched and hopefully hidden behind the altar, still in melee range of the southern skeleton.

Walt winces at the sight of the attack on Aranor. He responds by casting Thorn Whip, lashing the dino closest to Aranor with a thorny vine. He attempts  to pull the dino away from the moon elf. He follows that up with a strike from the archer on any dinos still remaining.

Walt calls out to his friend "Aranor! Get out of there!"

Action: cast Thorn Whip on the dino closest to Aranor. To hit: 16 for 4 piercing damage. Walt attempts to pull the dino 10 ft closer, giving Aranor space to move if they choose.

Bonus Action: Archer strike on any remaining dino threats. To Hit: 15 for 9 radiant damage.

Zartan will use his Bonus Action to use his telekinesis and pull Aranor away from the Dino. 

Action is to blast the Dino’s again just as before. 
DEX 14 Save or take 9 cold damage. Save for half. 

Walt transmutates a long, vine-like whip covered in thorns into being, that lashes out at the dino (#2) assaulting Aranor.

It strikes, and with a mighty heave, he wrenches the pile of splintering bones closer to him, dragging Aranor along with it. 

Walt then looses a glowing celestial arrow, that shatters the dino's skull clean off its spine. The undead skeletal dinosaur collapses into a heap of broken bones. (#2 is down.)

Zartan pulls Aranor further to safety (Aranor may make a DC14 STR save if he wishes to fight it.)

Stepping forward, Zartan releases another blast of frost from his rabbitoid maw to catch the remaining dino. DC14 Dex Save: 12

The damaged bones begin to shatter in the cold. It takes a hesitant step forward before collapsing in a heap, next to its bony comrade.

Combat is over.