The bookcases are large and heavy, a few move a bit but most seem very attached in place. You don't see any sign or evidence of anything hidden behind them.

You can see all manner of tracks going around this room. Some heading out either direction. 

The hallway goes on for about 40 ft before taking a sharp right hand turn. 

Finding the location of the empty bookshelves odd, she takes one more good look around before deciding they should start heading down the hallway.

Perception  27

Anvil looks at the anchored bookcases for a moment longer then turns and follows Gaetana down the hallway.

Annoyed at the people inspect the bookcase for a while, Sulfas take a moment to give it a hard kick before heading down the hallway. 

The hall goes down to the turn and then another quick turn leading a ways before you come to another set of closed stone doors. 

Gruno will head up to the doors and check for any traps they might possibly have.

Investigation: 23

They are a heavy set of stone doors, very similar to the ones you've encountered here. There doesn't appear to be any traps of locks on them. There is a large hammer carved into the doors.

"Well, let's see what we have behind these doors.." Gaetana takes hold of the right door and pulls it open.  She pauses before going inside and looks around

Perception  15

The door moves open without making too much noise. The room is well lit and done in brilliant white marble. The ceilings in here are roughly 20ft high. You can see floor to ceiling tapestries, 4 of them, each depicting a differently dressed dwarves male. There is central raised Dias upon which sits a massive stone sarcophagus. Unfortunately you are not alone in here.

A supernaturally large orange ape is exerting its tremendous strength, attempting to force open the lid of the sarcophagus while tow robed figures and a pale dwarf look on.

They haven't seemed to notice you all yet.  

Anvil readies himself to move depending on what signal Gaetana gives as she looks into the room.

"You think this will put up  a better fight than the last enemies?" Sulfas wonders out loud as he tightens his grip on his axe.

Is Gaetana still looking into the room, or is she letting the others know what she's seen?

As Gaetana looks into the room, she whispers back to her group, "So we have a King Louie and three others occupied with a sarcophagus at the moment.  Any idea on how we want to approach?"

"So far no one has been friendly since we've entered the tunnels," Anvil says. "At this point the probabilities are that these ones will also be hostile."

History: 19  (rolling to see if a large orange ape rings any bells)

"Are they trying to open the sarcophagus?"

Anvil you do recognize this creature as a Balgura a summoned demon. 

As Anvil asks if they are trying to open up the sarcophagus, Gaetana nods, and pulls out her long bow.  She does this slowly, so if anyone wants to stop her, she will relent.  She aims at the ape, whispers "You are my foe" casting hunters mark using her bonus action (since they don't see the party yet, I'm assuming she has advantage, take first roll if she doesn't)

She looses her first arrow at the ape, and very quickly looses a second.  She then sends her wolves in to attack.

Attack: 13 Damage: 7 + 6

Attack: 21 Damage: 5 + 1

Well alright! Since they haven't noticed you all go ahead and take a surprise round then everyone roll for initiative. 

Sulfas Imitative: 2

Sulfas charges at the Balgura with his great axe, attempting to split the demon in half with two strikes.

Attack: 28 Damage: 10

Attack: 23 Damage: 7

Gruno's eyes widen as the attack goes off, but he quickly swings his crossbow up and fires at the Barlgura.

Attack: 28 Damage: 13

Sneak Attack: 22

(Extra sneak attack damage due to crit): 19

Total Damage: 45

Anvil eyes the blue-faced Barlgura and considers banishing it back to the unending Abyss it came from, but his companions appear to have the demon under considerable pressure. It won't survive that onslaught for long.

Instead he turns his attention to the other three, focusing on the pale dwarf.

He moves forward quickly. As he moves, Anvil waves his shield at the dwarf, brings it down like a hammer, and says "spirita martelo" at the same time. A floating, shimmer hammer appears in the air on the other side of the pale dwarf and immediately smashes down.

Anvil then finishes moving across the room and swings his mace in a short arc at the dwarf. If the mace connects, a shimmer of energy transfers from Anvil to the dwarf and licks of bright flame leap up.

Bonus Action: Casts Spiritual Weapon  - Attack: 25 Damage: 8  

Action: Mace - Attack: 15 Damage: 7  plus Divine Strike fire damage of 2