Ordrin puffs up his chest and hefts his mace and shield. "Now," he says, "we go in." And he steps forward. But, only just a little bit. Just his toes, in fact, crest the threshold of the doorway. As he hunkers down behind his shield with Lightbringer held aloft, he rocks on his heels and waits. A few beats pass. Ordrin begins to feel the expectation of his companions and finally speaks up again, though softer this time. "Hello? Show yourself if you be present. The righteousness of Moradin calls you forth."

 Before stepping fully into the room, Ordrin scans as much of it as he can, floor to ceiling. Absent any hazards, he enters, keeping a careful eye on the corpse.

Perception: 16

As Ordrin steps in fully for a look around, there is nothing that strikes him as a hazard: Be it a hostile one, or threat of the environment crumbling down on him. The uncomfortable and sickly feeling remains, but otherwise things remain as quiet and as still as the grave, excluding whatever noise the party made in their passage. It is in Ordrin's second once over of the room that he notices an oddity in the debris collected in one corner. What at first had been mistaken as ashy linen that somehow survived the battle looked more and more like... was that fingers?

Ordrin might try to reject the thought. But with the question now in mind, the harder it became to avoid noticing the other subtler details of what could only be a pile of human skin laying in the corner in a clump; the bones and internal organs having somehow been perfectly removed, giving it a semblance of a suit. Before Ordrin at least can say more than a few words on the discover, the atmosphere turns unnaturally chilly all of a sudden. "You've come a long way, my would be thieves.... Impressive." A raspy voice spoke, seeming to come from all around the room. "It would be a waste to add you to my Mire, as its so hard to get good help down here. So.... Why don't we make a deal?" 

Pip watched as Ordrin stood in the doorway and nothing happened.  He then stepped further into the room and still nothing happened.  Pip, screwing up his courage then follows behind him and steps into the doorway buy lingers near the door going no further than stepping aside for others to enter as well.

When he hears the voice he nearly jumps out of his skin but manages to not cry out more than a small squeel.

"Who are you?" he calls out.

"Who am I? You gnomes and your games." The voice responded. Pip then feels a looming presence just behind him. But if he turned to look, there's nothing there except perhaps Riris looking about for the source. "But I suppose its a fair question. That pompous bastard Vargimmley was never that good with keeping names straight in that empty skull of his. Makes me wander why the others were convinced he'd make a good guardian before." A raspy chuckle can be heard echoing throughout the room.  "In life, I was known as Mormesk Bellavont. But as I am now, you may call me 'Master', should you accept my deal... or, your End, if you don't. And my patience grows thin. So, I would advise you choose your next words wisely."

Mixum tries not to shrink away from the raspy voice. "A deal. What kind of deal?" His voice squeaks but his grip on his crossbow is steady.

Pip almost jumps at the sound of Mixum's voice but he manages to stay standing.  "Right then, what kind of deal?" he echoes

"The deal is quite simple my gnomish blooded guests. In exchange for your lives and your souls, you agree to become my hands and ears in the world beyond these miserable mines. Do what I ask of you exceptionally well and not only might I share my knowledge and power with you, but elevate you into a far greater forms than than your current fragile bodies." Mormesk said; his voice continuing to echo around the chamber. "Simble, no? Unfortunately, unless your dwarvish blooded friend renounces his faith, his demise will be my first request of the rest of you."

"Hmmph!" Pip says a bit indignantly "Well, that's not a very good deal at all.  You must be the fellow Vargimmley spoke of.  I can see why he dislikes you so much.  I suppose we'll have, well, have to ask you to leave."

Mixum:  Bellavont, we reject your offer. Leave now or we'll be forced to bring you to justice!

OoC: if we can have a pre-initiative action:

Ordrin hardly hears a word of the conversation with Bellavont. He feels as if he is underwater, with darkness around and below. But looking up as if seeing the sun and the water's surface, he feels the divine warmth of his patrons, Moradin and Sharindlar, bathing him with divine goodness and it flows from him to his companions.

Ordrin casts Bless on Pip, Mixum, and himself.

Mixum Initiative

3

Ordrin initiative: 19

(Ordrin falls asleep)

Pip initiative 21

Riris: 6.
B: 18.
S: 16.
K: 2.
Mormesk: 11

Undead Reinforcements North: Initiative Count 20. Arrive in 'You'll Find Out Eventually' Round.
Undead Reincorcements South: Initiative Count 1. Arrives in 'Even Later' Round. 

Visuals:

Boneless:

Shadow Wolf: 

Keleton: 

Mormesk(when he appears): 

What started as a dark chuckle erupted into full blown bout of chilling laughter in the wake of Mixum and Pip's defiance.The sound of which appears lost on Ordrin, as the cleric had slipped into some divine trance; the words of prayer on his lips, but never truly uttered before Mormesk regains his composure. "So young. So foolish. But very well. Perhaps after my minions are done with you, you'll be in a far more 'agreeable state'. AWAKEN MY SERVANTS! RISE FROM MY MIRE, AND BE COUNTED! YOUR LORD HAS BEEN AFFRONTED, AND DEMANDS RETRIBUTION!" The voice bellows out; this time seeming to not just echo about the room, but into the caverns and tunnels beyond, overriding even the thunderous boom of Wave Echo Cave's atmospheric namesake. 

Even before the echoes of the command finish dying down in a distance, the party can see movement from various parts of the room. From the shadows of the broken bed to the northeast slipped out a wolf seeming made darkness easily the size of a grown man. Its red eyes and pearl white teeth being the only color on its form. By the other bed, the ashen skeleton pulls itself together as it rises from the bed. The ruined sheets magically following after it, changing in color, and wrapping itself around it like a makeshift robe. And from just north of the party, the 'pile of linens' writhes and rises, further confirming Ordrin's horrifying conclusion as the skeletonless remains of a human body given twisted life.

"Uh, guys! Not to alarm you, but I think I hear a lotta bones rattling from both ways. Whatever we're to do, we best end that bastard quick!" Riris warns from the back while frantically looking between the north where the group came, and the unexplored southern tunnel. Again the group can hear Mormesk chuckle from all around as the final confrontation begins at last.

Lair Action:
Feast on Life - Creatures within 10ft of Boneless or Keleton on this initiative count must make a DC 11 Con Save or take 2 Necrotic Damage.
As Mixum and Ordrin are the only ones, both need to make a Constitution Save. 

Ma: 14-K.
Ac-Boneless Multi-Attack:
Slam vs Mixum(AC 17) - Attack: 15 Damage: 5 nonmagical bludgeoning. 
Slam vs Mixum(AC 17) - Attack: 21 Damage: 5 nonmagical bludgeoning. 
If both hit, Mixum is considered Grappled. 
The above also assumes Charlotte uses her Deflect Attack reaction on the 1st attack. But if not, we will go by the 1st roll in the sequence as always.

Ma: 15-M.
Ac-Bite vs Ordrin(AC 20) - Attack: 16 Damage: 9 nonmagical piercing.
If hit, make a Strength Save(DC 13) or be knocked Prone.

Lair Action: As the party tries to settle in for the fight, those closest to the Boneless creature feel as if crushing is being exerted upon them from all around. As if the very air thick and malevolent for just a few moments, before normalizing once more. Those whose' vitality proves to weak spit some strange globule of energy that immediately zips into the nearby horror, eliciting a choked and sinister laughter.

Although still a bit faint, the sound of clattering bones of the Undead Reinforcements can be heard echoing from the north...

The Boneless face shifts into a mockery of a joyful smile as it lurches forward on hands and knees, readily climbing up Charlotte's body as it aims to punch Mixum with unearthly strength. Try as Charlotte may to try and knock the thing away from their creator, every blow successfully landed threatens to give it purchase and begin further ascending to smother the gnome.

The Shadow Wolf then stalkers forward, growling and appearing almost to smile wickedly at Ordrin. Yet just as its feet touches the bright light edges of Riris' torch, it reels back for just a moment, glaring at the light, before making a feral lunge all the same for Ordrin's throat while trying to bodily knock the dwarf to the ground.

Pip is now up! 

Initiative Tracker(Round 1):
Lair Action - 20
Undead Reinforcements(N) - 20 (Appearing in ???)
Boneless - 20
Shadow Wolf - 16
Pip - 11
Mormesk - 11
Riris - 6
Mixum - 3
Keleton - 2
Undead Reinforcements(S) - 1 (Appearing in ???)
Ordrin - 0

Key: 

M=Mixum
O=Ordrin
P=Pip
B=Boneless
K=Keleton
S=Shadow Wolf
R=Riris
E=Mormesk
U=Undead Reinforcement
D=Undead Reinforcement

 Updated Map:

 

Mixum Con Save:  8

OOC:  Looking at map-- At some point (R) might want to come in the room and close the doors so the reinforcements are on the other side of it. If those are doors and if they close. 

Pip gives a bit of a shriek but then gathers himself.  With a wave of his staff he mumbles some words and reaches out and touches Ordrin casting Protection from Evil and Good on him.

He then moves 25 feet straight south.