Ravi peers at the glue-like substance, as well. (He's no detective, though he does ask for a bit of divine insight)

Investigation: 3 + Guidance: 1

He has been inspecting this tunnel system as they walk, as well. Are they naturally formed or made by hands? If dug out, how long ago and by whom?  

(Anything gleaned from his study of the tunnels, DM? Something that would help them to better navigate? Stonecunning+Guidance: 24 + 4)

"Weird glue stuff," says the dwarf as he prepares to deliver a dissertation on this cave system.

 Neither Tovar or Ravi can discern what the white substance is. However, as Ravi drags his fingers across the stone walls and takes in the structure he quickly notices something odd. The caves that you are in now all consist of the same magmatic rock with specks of different rocks here and there, but when the dwarf inspects the glue covered wall closer he notices small pieces of completely different types of rock. A large chunk of cut soapstone is lodged at the bottom of that particular piece of the wall and further up there are tiny white pebbles of red marble among the otherwise grey rock and the white substance. He sees that the soapstone and marble bear clear traces of the use of tools even without dislodging them from the wall. 

Meanwhile Gullinbursti, the mechanical boar heads down the hall to the south and stops as they notice a large cluster of eggs on the right hand side, the eggs are cracked open and the greenish grey goo within have either spilled out and has formed small puddles on the floor around them or lay in small pools in broken pieces of egg shell. The hall continues further south beyond this alcove.

"There's an open space behind this wall," Ravi mutters, half to himself. "More like a facade. It's cunning work... I think if I-"

He pushes against the stone.

STR (with guidance, if allowed): 15 + 2

The soapstone loosens, but the wall itself still stands. 

"Tovar!" says Ravi quietly. "Come give me a hand with this wall. There may be something on the other side."

Moved by Ravi's plea, Tovar responds. "Yes. Together, then!"

Ravi's mod is higher than Tovar's, so Tovar will help.

Gunnar is going to examine the eggs and the sludge. Does it look like these hatched recently? Is the sludge acidic?

**BANG** The wall crumbles inward as the huge man and the armoured dwarf ram into it together, both of them barely falling over as they wall collapses inwards. As soon as the echoes of the clatter of rock against rock dies down they're aware of the sound. Clicking noices, like the ones they heard earlier, getting louder.

On the other end of the tunnel Gunnar is leaning over to inspect some of the sludge when he notices it shift. Before Gunnar manages to pull back the ooze tries to whack him across the face. 
Attack: 9 Damage: 5 bludgeoning & 7 acid damage

ROLL FOR INITIATIVE EVERYONE!

Initiative: 15

The ooze whiffs by Gunnar as he stumbles back, “Of the many things that I expected, this wasn’t one of them!”

Initiative: 13

"Why did you have to make so much noise?"  Ruby backs up against the western wall just north of where they entered the cavern, looking in both directions to try and determine where the clicking sound is coming from.

Perception: 5

Ravi brings out his shield and gives his warhammer an experimental swing. He hasn’t broken any skulls since that business with the sea hag last midwinter. “I suppose I owe you an apology, Ruby,” he calls back with a grin. “Tovar and I are the ones bringing trouble on our heads, not you.”

Initiative: 9

Initiative: 9

"Ooh ahh!" Shouts Tovar as his not inconsiderable bulk slips forward. As the dust settles and he stumbles to his feet, Tovar hears Gunnar's cry and the chittering voices. "It seems we have found the unwelcome guests! Please, for to be making welcome!"

Tovar and Ravi barely manages to push themselves up before the ground itself bursts 10 ft in front of them. A large, spiked, chitinous creature throws pebbles and dirt into the ceiling as it digs its way up from the ground. The creature makes clicking sound followed by a unnerving hiss before it launches a small cluster of spikes straight at Tovar!

Spike Attack 1: 20 Damage: 4
Spike Attack 2: 21 Damage: 6

Initiative counter:
Large bug monster: 21
Gunnar: 15
Ruby: 13
????: 10
Ravi: 9
Cycle: 9
Tovar: 9
Gray Ooze: 3

"Mister Shanka, watch out!"  Ruby shrieks in horror as the creature bursts from the ground.  As it bombards her large companion with spikes they saw earlier in the tent, Ruby screams in anger, her eyes glowing white, electricity arcing around her body.  She instinctively raises her wand towards the creature, unleashing a ball of lightning that crackles across the tunnel.

Chromatic Orb (cast at 2nd level)

Attack: 22 Damage: 16 Lightning Damage

"Not to be worrying!" Shouts Tovar, catching the spines on his hurriedly readied shield. "I am professional!"

With a steady hand turning his battleaxe to the ready, Tovar twists and swings mightily towards the bug monster!

"Bad bug! Go to die now!"

Attack: 15, damage: 4

Gunnar is going to get out of the range of the slime, assuming it attacks with an AoO.

Regardless, he rolls and drops to a knee, leveling his enhanced crossbow at the creature. He draws his finger along a line on the crossbow. As he does, orange energy seems to fill the line as a [Tooltip Not Found] forms the bowstring. Gunnar mutters as he lines up the shot, “Wayland Arcanomechanic Rifle: Firedart Mode. Accept no substitutes.”

Attack: 25 Damage: 10 piercing damage + 6 fire damage

Gullinbursti will stay within 5 ft of Gunnar and impose Disadvantage against the AoO or any attack against him, due to Defensive Pounce.

As Gunnar runs away the ooze swipes at him with a gooey appendage. 
Attack: 9

The crossbow bolt sizzles through the air leaving a thin trail of smoke before burying itself into the amorphous form of the gray slime. Before it disappears within the ever jiggling form of the monster it is clear that the arrow damaged it as the heat of the fire causes part of the ooze to boil before it is engulfed.

Ruby's scream of chaotic magic flashes in a pale blue color for just a second as if lightning struck from the ceiling of the cave itself and the bolt of energy crashes into the bug monster. Lighting crackles across their body as it releases a screech of pain. 

As if reacting to the pained screech the clicking grows louder and in the darkness in the room beyond the freshly crumbled wall and faint shapes can be seen closing in on the group, crawling on the walls. 

Ravi hefts his warhamer and sends it crashing into the monster's head.

(rolled on discord)

Attack: 8 Damage: 10

But he fails to leave a scratch! Huffing in frustration, he glances back at Ruby and taps his hammer lightly against his shield, wrapping the sorcerer in iron light.

The Cycle rushes up towards the insectoid monster stopping about 10 ft from it. A skeletal, half rotted hand appears above its head, clawing at it as the druid casts Chill Touch. The Cycle then taps the end of his snake headed staff into the ground and it starts glowing in a dark green color under the effect of Shillelagh. 
Attack: 14 Damage: 7

The attacks of Tovar and Ravi just bounces off the creatures thick carapace. In response the monster turns its head and with a series of clicks and screeches it seemingly gives commands to those behind. It then turns to Tovar and snaps at him twice with its large toothy maw. 
Attack 1: 22 Damage: 6
Attack 2: 8 Damage: 5

Ruby gasps and slumps to her knees as the energy pours from her, into the wand, eventually crashing into the creature.  This felt different to her previous outbursts, she almost felt like she had some control over what she was doing, the wand acting as her guide.  Unsteadily rising to her feet, the half-elf tries to repeat the process, gritting her teeth as the wand pulls the energy out of her, eyes this time like blazing fires.

Chromatic Orb

Attack: 19 Damage: 15 Fire Damage

Another bolt of fire materializes in Gunnar’s crossbow before being launched at the ooze, Attack: 14 Damage: 8 piercing damage + 6 fire damage. Gunnar then places a hand to his mouth, “Gullinbursti, engage!”

Gullinbursti snorts steam and charges toward the ooze, Attack: 5 Damage: 7 piercing damage. Unfortunately, it is difficult to gore a blob.

The ooze splashes across the walls as the final crossbow bolt is enough to take it out. 

Meanwhile the large monster shrieks in pain. Flames curl across its body singing the carapace and a few of the spikes on it backs crack due to the sudden immense heat. In the lights of the burst of flame you see as the smaller creatures come crawling across the walls towards you, casting large shadows behind them that disappear into the darkness beyond. There are 3 of these shapes and they seem to head straight for Ravi! Probably since he is the smaller target. Especially compared to the massive man that is Tovar. Two of them at ground level about waist high for Tovar, but at chest height for the dwarf. The other one latches to the wall next to Ravi. They all strike with spiked forelimbs towards him. 

Attack 1: 24 Damage 1: 6
Attack 2: 17 Damage 2: 7
Attack 3: 25 Damage 3: 5

Crit damage: 2