As Rudick stays his hand at the last moment, Skip lowers his head mournfully, pulling the blade away

"So mote it be." Leann murmured to herself. She was not sure what would happen from this point, but felt more secure with this group than she had previously.

Rudick, you lift the battered form of Lucan from the altar and lay him aside. You raise you hammer over your head with both hands, and then swing downwards with all your might. With a great cracking noise, the altar shudders from your strike as it splits and cracks. The chanting suddenly cuts off as you do. You look up at the figures, and all 13 pairs of glowing white eyes stare at you and make no sound. The air around you drops in temperature, and a smell of rot and death wafts through the air.

Sergei looks around and grits his teeth.

"Come on," he mutters, "Let's get this over with, one way or another."

Rudick grins back at the figures in defiance. However, as the sickening scent and chill began to fill the room, a sense of wariness began to creep into both mind and posture. For a moment, he contemplated bring the hammer down a second time to try and further sunder the altar. Before that thought can get any real traction though, he says to the others, "Ready yourselves. It seems our host has one final treat for us!"

After a moment of searching the area, his eyes finally falls back on Lucan; who after some mental debate, the Orc chose to pick up again after putting away the hammer. "Should get you out of this room, first."

As the orc picks up Lucan, Alev braves himself to stand up and put himself between the two and the figures, just in case any tries to attack. 

Brandishing his new dagger defiantly, he casts Gust to try to clear the air of the smell, and a gust of wind whirls around him and his companions for just a brief moment.

"Bring it on!" He shouts in what was supposed to be an epic warcry, but his voice cracks, so it ends up sounding more like the cry of a hawk. Heh, good enough.

At your show or defiance, the figures chant in unison, "Lorghoth the Decayer, we awaken thee!"

 A frozen wind whips around the chamber as the figures melt into the darkness around them and disappear. The smell of death intensifies despite Alev's efforts as the water turns to ice. Everyone in the water needs to make a Dexterity Saving Throw of 12 or higher to avoid being grappled. (I don't remember who was in the water, so if you were, just roll please). The frost and ice makes the chamber difficult terrain.

The wind swirls around the mound of refuse in the small cave in the back wall. You see the pile shift with monstrous growl as a huge form rises from it. You see a monster made of bones, entrails, organs, blood, and garbage rise from the pile and roars.

Everyone roll initiative.

Leann dex save: 20
Leann initiative: 7

Dex save 25
initiative 10

As Rudick Smashes down his hammer on the altar, Skip takes the chance to try and blend back into the background, in preparation for what will undoubtedly be a grim fight

stealth 12

Alev's initiative: 3

Despite his bravado from just seconds ago, Alev hides behind Rudick when the monstruous form starts to rise. When it shows itself, however, he is more grossed out by it than scared. "So this is the "heart" of the house?!" He retorts, looking at the abomination made from entrails and other nasty stuff. "...Gross."

From where he is, he concentrates and hisses something in draconic, and flames begin to spark from under the pile. He stares at the monster as he tries to will the living pile of garbage to burn. 

Casting Create Bonfire

((I don't remember if Alev was in the water, I think not, but just in case:))

Dex save: 2

Sergei was on the platform right next to the altar.

Initiative 13

Sergei would frankly rather flee, this thing doesn’t look too fast, but he doubts that will be palatable to all, so he will fight with them.

Sergei’s black eyes fade and lighten to their normal appearance as he concentrates on a new spell. He summons forth a dark spidery symbol which rests on the huge moving abomination, and then follows it up with an eldritch blast, trying to strike the symbol with his dark slashing fire as if it were a bullseye target.

Cast hex

attack with eldritch blast Attack: 17 Damage: 12 force + 6 necrotic

After that he will get down from the platform and carefully move to the edge of the room, but edging towards the exit.

Sergei chooses strength for the other hex ability, but he’s open to ideas from the team as to whether a different ability would be more useful

Initiative: 18.
(Obvs. Rudick was by the altar, so should be good on the Dex Save)

(Also, Bonfire is a dex save for the target, not an attack roll.)

"Or their pet. Either way, it shall be sundered as surely as that altar. Fall back for the entryway here. We'll bottleneck it there. Those that can lay down suppressing fire!" Rudick commands before slapping a palm on his shield, and beginning to recite the verse of the first half-plate. Or at least, rendition of it as a prayer. At its conclusion, glowing runes appear across the edges of the Orc's armor as if freshly stamped, creating an invisible barrier.

Bonus Action: Cast Armorer's Delight.

Action: Pick up Lucan.

Movement: At least 10ft closer to entryway.

(@DM: If picking up Lucan would be considered a Free Interact action, then he would cast Sacred Flame(Dex 12) first for his action, inflicting 5 radiant damage on a fail. Before then carrying out all else.)

Springing out of the shadows with both swords, Skip comes up behind the monstrosity

attack rapier 9
damage 10
off hand attack 18
damage 7
sneak attack 1

Sergei shouts “Skip, get away from that thing!”

Leann moves to strike at the creature...

To hit: 9 Damage: 11

Lorghoth Initiative: 19

Dexterity Saving Throw: 16

Alev's words reverberate through the air and transforms the air around Lorghoth into fire. It bursts into flame, and a portion of the fire is drawn to the ground and creates a bonfire below it. It appears unfazed by the flames licking its vaguely humanoid form (resistant to fire damage). An acrid smoke rises from its body as it sizzles from the heat. Skip materializes from the shadows near it and lashes out with his weapons. One of them glances off from its form, and a spurt of blood sprays from the small cut that intercepts his other strike. The blood blocks the other attack with a malevolent intelligence. Leann skates toward and swings her blade towards at the creature. With frightening speed, it raises its meaty forearm and knocks aside her blow. Sergei forms an arcane curse symbol around the abomination just before his beam of dark energy lances through the air and slams into the monster. It strikes it chest, and blood sprays through the air from the impact. It gives a guttural growl at the strike. Rudick says a few words of power, and the air shimmers around him as a spectral  suit of armor appears around him. He thrusts out a hand, and a tour of radiant power bursts from his hand and rockets towards Lorghoth.

Dexterity Saving Throw: 2

Thadalas shoots an arrow. Attack: 18 Damage: 11

Tomm casts Sacred Flame. Dexterity Saving Throw: 19 and 7 radiant damage.

The divine energy from Rudick and Tomm says over Lorghoth with no effect as the unholy power animating it deflects the energy away. Thadalas's arrow pierces it through the chest, and blood sprays through the air. With an incredibly loud, bone-shaking moan, it lunges towards Leann and tries to strike her. You watch as its arm stretches and tears to reach her. A tentacle made it muscles and viscera erupts from its back and tries to slam into Skip. 

Against Lean-

Slam Attack: 26 Damage: 13

Against Skip-

Slam Attack: 23 Damage: 12