Psalm, seeing his ally go down, and assuming he's been slain, aims to protect him from further harm by taking out those who did him so dirty...

He draws his rapier and charges into the fray, bolting past Dain to stab at the half-dragon drow wildly before spinning out of the dark elf's reach and standing in front of Zylborin to protect him from further harm.

TURN BREAKDOWN

Zylborin collapses to the floor. He begins to mutter in his drowsy slumber.

"But Dad... I don't to be a used wagon salesmen... I want to be an actor..."

[[ Quick post. Will update the map later. ]]

It seems Psalms' rapier wasn't able to get past the mass of armor and scales on the HDD though he gets away safely, for now, as Zylborin dreams of a musical career in the face of fatherly disappointment.

The HDD moves to be in front of Dain and lowers her jaw to belch out an acidic stream.
Movement: NW

Finn may take an opportunity attack against her

Acid Breath @ Finn and Dain //Finn gets +2 to DEX for interposing creature
Damage: 27 acid
DEX Save DC 11 for half

Meanwhile the other drow seeks another target for his hand crossbow. 
Movement: 20ft East

Hand Crossbow @ Psalm
Attack: 22 Damage: 3
On a hit make a CON Save. 

Initiative: Party is up. Sampson may take 3 actions.

(( Finn's DEX Save: 9 ))

(Sorry for the delay here!)

(I'll try to type out all the actions as best as I can!)

Sampson snaps out of his idle state and bursts into the fray! Divine light seems to glow dimly off of him as he moves more swiftly than before!


Action 1 : Dash 45 ft to the right
Bonus action: Cast Mass Healing Word, restoring 8 to all allies within 60 ft.

Action 2: Cast Toll The Dead on the Half Dragon Drow. DC16 Con Save or take 13 necrotic damage. 

Bonus action: Healing Word at 1st level on Zylborin. He will regain another 6

Action 3: Cast Toll the Dead again at the Half Dragon Drow. DC 16 Con save or take 13 necrotic damage. If the half dragon is dead, Sampson will target Drow 2

(Not sure why the damage is so showing as so high with the first casting of Toll the Dead. It says it rolled a 7 and 6, but is showing 21 damage lol.)

(Edit) (My bad, I think my computer is just being super slow. I think I actually got lucky with those damage rolls. Now to see if the enemies fail their save lol)
(Second Edit) (I realized I said it was a CON save instead of a Wisdom save, my bad.)

"Back on your feet, friend! You'll still have plenty of time to be an actor!" Sampson shouts to Zylborin.

Dain's DEX Save: 16

One way or another he'll survive the attack, so,

He attempts to shove Finn behind himself as the acid flies at them, and perhaps knocks the lad off his feet with too forceful a shove. "Nasty wench," he cries out in response, rapidly wiping the acid from himself. He then sees that it burnt off some of his chest hair and growls, "Now you've done it."

Reckless Attack Intensifies:

Attack 1: 16 for 11 Slashing damage

Attack 2: 15 for 16 Slashing damage

Finn took a swipe at half-dragon as she moved, only to receive a face-full of acid in response. He quickly brought up his oversized blade to block some, but not all of the corrosive liquid. (( He'll take 13 damage. Concentration save of 15 vs DC 10 was successful, via the character sheet. ))

"You're gonna pay for that," he sneered as he moved to close back in with the miscreant, now choosing to curse his foe with additional magic from his patron. He felt weakened from the poison as he swung, but was determined to finish the half-dragon off.

MOVE: To close back in with the half-dragon
BONUS: Use Hexblade's Curse on the half-dragon. +3 damage, crit on 19+, and +10 HP when she dies
ACTION: Attack the half-dragon, with disadvantage from being poisoned
* Oversized Sword Slash 1 - Attack: 15, Damage: 15 Magical Slashing & 1 Necrotic (plus 3 & 5 on crit)
* Oversized Sword Slash 2 - Attack: 11, Damage: 16 Magical Slashing & 1 Necrotic (plus 8 & 2 on crit)

End of turn!

// DM question: Zylborin will still be unconscious even after the healing, correct? As it's an effect from the poison bolt?

Quote from Lil50ae77 >>

(Not sure why the damage is so showing as so high with the first casting of Toll the Dead. It says it rolled a 7 and 6, but is showing 21 damage lol.)

[[ Forum dice roller can be whack at times with saying your rolled something totally different than you actually did. :P ]]

Quote from swoop7 >>

// DM question: Zylborin will still be unconscious even after the healing, correct? As it's an effect from the poison bolt?

[[
Yeah. Zylborin is still sleeping away.
That said, given Sampson is intent on getting Zylborin back in the fight, has a decent medicine score, and would see the after-effects of the Mass Healing Word, will note that Zylborin can be woken up with an action to shake him back into consciousness.
]]

Sampson casts magic at the half dragon while Finn and Dain sink their weapons past the armor, all of their attacks except for Dain's second attack landing hits.

[[ Has an AC 18 with the shield, but had her take a shot with the hand crossbow earlier, so those 16s are getting through. ]]

[[
11 slash, 15 12 slash, 3 necrotic, 19 16 slash, 1 necrotic
Subtotal: 43
@RodTheBard, noticed you had a +9 on those damage rolls as opposed to +6. Guessing just mixed up with the attack modifier? Or is there a feature I'm missing that grants the extra +3?
]]

HDD WIS Save: 14 vs DC 16 and 21 necrotic

Drow WIS Save: 17 vs DC 16 and 20 necrotic

Quote from VitusW >>

Drow WIS Save: 17 vs DC 16 and 20 necrotic

I forgot to take out the +4 and change it to a +0 when using a the Drow's WIS Save instead of a Drow Elite Warrior WIS Save, which makes that actually a 13 which is a failure and sufficient to kill Drow 2.

Through magic, greataxe, and oversized sword the party is able to defeat the drow as they fall to the floor. Some acid still drips but the battle is over.

Out of initiative

In the room of the Drow you're able to see shelves to the East in what looks like an experitmental workshop of sorts. To the West are cushions laid out, looking like trance resting spots for the drow. And to the South a bit of a webbed off private area.

And reminders of the map outside the room

Quote from VitusW >>

[[
11 slash, 15 12 slash, 3 necrotic, 19 16 slash, 1 necrotic
Subtotal: 43
@RodTheBard, noticed you had a +9 on those damage rolls as opposed to +6. Guessing just mixed up with the attack modifier? Or is there a feature I'm missing that grants the extra +3?
]]

(( It was probably the Hexblade's Curse; that added +3 to the damage. It also made his last hit a crit, but there was already enough damage to finish him off, so no worries. Aaaaaaand that reminds me... +10 HP! ))

Finn breathed a sigh of relief, as healing energy washed over him. Floating back down to the ground, he finally took a good look around at the area they were in. "Surely none of this is important?" he asked as he made his way over to the eastern bookshelf and examined its contents.

(( Perception Check: 15 ))

Psalm moves to the cushions, plops down and kicks his feet up and stretches. "If all you brainy types are gonna go book shopping, mind if I kick up my feet a moment?"

“Aye, it’s time for a break. Lots ‘o targets in here.”

Assuming he can’t do anything about the poison, Dain carries Zylborin onto one of the cushions and hopes he’s comfortable before passing out in a chair like a an overworked dad. 

Sampson rushes over to Zyborin's side and attempts to wake him up.

Zylborin stirs from his sleep, feeling groggy like he's had too many wines. 

"I thank you, kind Sampson, did we win? I'm disappointed I missed it, you'll have to fill me in on the details!"

Psalm is digging through his pack for some jerky as Sampson wakes Zylborin up. He gives a bemused smile when he sees the dragonborn stir. "Oh, hey! You're not dead! How 'bout that?"

He stuffs a piece of jerky in his mouth and offers the other to the dragonborn. "Jerky?" He asks.

[[ @Rod, yep. I missed the Hexblade curse. And hurray for regained HP! ]]

As Sampson brings Zylborin back to the land of the awake while Psalm and Dain kick back on the cushioned chairs, Finn takes a gander at the bookshelf.

He's able to see a collection, primarily written in Elvish and Draconic. Within the images he sees depictions of poisons, bestiaries of creatures including specimens like quaggoths and otyughs, in addition to depictions of half-dragons with notes scrawled in the  margins. Finally another book seems to be an atlas of sorts with maps of regions Finn would have never seen before, perhaps what lies beyond the mountains?