Kwiz, in an excited flurry of gnomish footsteps retraces their path back towards the entrance with Rush and the others closely behind him (in much less of a hurry since everyone else's footsteps take them further). Once Kwiz reached the entrance hallway, he takes a left and just as he's about to turn right at the end of that hallway in order to continue following the directions, he was given...

Kwiz has to make a Dexterity Saving Throw: 22

Just about as soon as Kwiz made it to the end of the hallway in order to turn right, a giant arrow flew right over his head, almost parting his hair. The arrow flew past him, planting itself firmly in the wall behind him. He skids to a stop. 

Everyone rolls initiative. 

Kwiz: 12 (this includes Duncan)  |  Oban: 11  |  Rush: 14  |  Willem: 22  |  rock gnome recluse scientist: 1

 Round 1 (00:00 - 00:06)

What you see inside the room that you're looking in is this huge contraption with what looks like a mad scientist rock gnome recluse. Bolted to the floor of this room is a rotating platform equipped with four heavy crossbows that reload automatically. Mounted above the crossbows at a height of about 6 feet is a chair equipped with pedals and levers. This clanking, clattering contraption is a Large object. 

The mad looking gnome sitting on top of this contraption in the control seat is laughing maniacally.

Initiative order: 

1. Rush
2. Oban
3. Willem
4. Kwiz (and Duncan)
5. Rock Gnome

 As a reminder, the passageways are only 5' wide (wide enough for one small or medium creature). 

Rush is going to hold until Kwisatz has moved out of the way.

Oban will move right up to the contraption and use a doulbe-attack with his shortswords against the big crossbow machine thing.

Attack 1: 6
If that hits, Damage: 7

Attack 2: 17
If that hits, Damage: 4

Willem will move forward and attack the crossbow with his war pick.

Attack: 9
If it hits, Damage: 5

The crossbow takes an unexpected attack on the group, shooting two arrows at the same time. One arrow will be aimed at Oban, the other will be aimed at Willem.

Arrow aimed at Oban, Attack to hit: 19
If it hits, Damage: 8

Arrow aimed at Willem, Attack to hit: 23
If it hits, Damage: 4

Here is where everyone is currently at:

((Kwiz sent his action to me in the OOC chat bc he's on mobile))

Kwiz, after gasping in surprise at being shot at by this crossbow, he creates a ghostly, skeletal hand near the cross bow and casts chill touch.

Ranged Spell Attack: 16
If hits, Damage: 4 Necrotic dmg

((If Rush wants to move, Kwiz backed up one space, and I'll give Rush the opportunity to go before the mad rock gnome recluse takes a turn.))

Oh, and I forgot to mention, one of the crossbows broke off right before the crossbow made an unexpected attack. So, there are currently only 3 crossbows left. The N, S, and E facing crossbows are still intact.

Rush will run forward next to Oban to try to smash the crossbow in front of him.

Attack: 9 Damage: 7

After Rush charged in, swung at this contraption and missed, the diminutive seemingly mad gnome starts kicking pedals and pulling on levers. The entire contraption lifts up about a foot and the gears that it's sitting on start moving and the whole thing rotates 90-degrees counter-clockwise. The contraption settles back down into place, and now, the broken crossbow is facing South. 

Round 2 (00:07 - 00:12)

We'll continue on with our original initiative order:

1. Rush
2. Oban
3. Willem
4. Kwiz (and Duncan)
5. Rock Gnome

Kwiz, even though he's standing further away from the next room, because he's less physically engaged with the crossbow, he's not as distracted by it and he hears what sounds like arguing between two or three people. (The others are too preoccupied with trying not to die.) One of them is speaking in Common, and at least one of them is speaking in Gnomish. 

Rush tries again to smash the crossbow. “This weapon is more problem for us than for a dragon!”

He then takes another swing. Attack: 19 Damage: 8

Rush attacks, again, this time, connecting with his target. The North facing crossbow cracks and breaks off. At the same time, another arrow flies off of the Eastern crossbow. 

Attack to hit Willem: 12
If it hits, Damage to Willem: 6

The crossbow misses, thankfully, as Willem (and Oban) are already pretty badly injured.

Oban attacks next with another double shortsword attack.

Attack #1 to hit: 12
If it hits, Damage: 9

Attack #2 to hit: 23
If it hits, Damage: 9

With that onslaught of swinging swords, Oban lays into the Eastern facing crossbow since that direction was posing the biggest threat, currently. He successfully dishes out 13 more points of damage. And, as he does, the Western facing crossbow shoots another arrow at the wall. No one was there for it to hit. The Rock Gnome, in a moment of anger, slams his hands in a fist against his legs before taking up the controls, once again. 

It's now Willem's turn and he takes another swing at the contraption with his war pick.

Attack to hit: 14
If it hits, Damage: 6

Unfortunately, with Willem's injuries, he struggled to get a proper swing of his war pick off at the thing, and he ended up impotently hitting one of the gears of the machine only for his war pick to ineffectively bounce off.

Next up, Kwiz...

"There's someone else down here!" Kwisatz yells to the team "We need to stop that contraption and find the king!" He then looks around for a stone, or torch, or anything fist sized to catapult at the rotating crossbow machine ((dc 13 dex or 12 dmg)). He then takes another step back, and two in the tunnel to the north ((that's where the voices are coming from yeah?)) to listen again.

Kwiz makes an investigation check: 17

Despite how smooth the cave walls and floor are, Kwiz finds a rock to use. Using his arcane abilities, Kwiz, tosses the rock in a straight line towards the catapult. 

Damage: 19

The catapult collapses in a dusty heap. The only thing standing is the chair that the mad rock gnome was sitting in, but the gnome is already on his way out and running towards the southern exit. Kwiz hears him say in Gnomish, "Well, each failure is one step closer to success!"

Also, much to Kwiz's surprise, he sprouts wings like those of a butterfly. The wings give the caster a flying speed of 30 feet.

Combat is over. Oban and Willem both look like they've seen better days. They each have an arrow planted firmly into their bodies; Oban with one in his lower abdomen, and Willem with one in his left shoulder.

Willem removes the arrows from himself and Oban and uses all 5 his Lay on Hands Pool: 2 for himself and 3 for Oban. They're still both battered pretty bad.

Here is the current map.

"Quick! There is someone else in here! Follow me!" Kwisatz says to the team, and heads toward the voices he heard earlier

((I'd already rolled the dmg for the catapult - thought it didn't seem to matter))

Rush will stop to attempt to cure the wounds of Oban and Willem.

Oban - 9
Willem - 9

After the battle, Rush goes over and casts cure wounds on both Oban and Willem, healing them both up completely. Their wounds closed up and the wincing on their faces relaxed.

An odd thing happened, though. While Rush was curing Oban, tiny, insubstantial motes of light began to circle him, shedding bright light in a 10-foot radius and dim light for an additional 10 feet. 

Confused a little, but not overly concerned since these motes of light appear to be harmless, he began to cure Willem's wounds. As he was doing that, he also sprouted wings like those of a butterfly. Rush now also has a flying speed of 30 feet.