Dungeon of the Mad Mage

When a drow shows great promise, Lolth summons it to the Demonweb Pits for a test of faith and strength. Those that pass the test rise higher in the Spider Queen’s favor. Those that fail are transformed into driders — a horrid hybrid of a drow and a giant spider that serves as a living reminder of Lolth’s power. Only drow can be turned into driders, and the power to create these creatures resides with Lolth alone.

You conclude that the summoning circle in the previous chamber is the transmission vector by which drow are sent to Lolth for testing. 

Deciding not to watch a Demi demon massacre imprisoned elves you press on, hopefully before it turns its rage towards you. 

The next cave abuts the sluggish River Sargauth and is filled with web curtains that undulate in the howling wind. Behind these curtains, carved into the west wall, is an old pirate rhyme:

If Skullport’s where ye wish to be,

With the Sargauth’s flow go ye.

If pirate booty is what ye crave,

Fight the surge to the captain’s grave.

After a brief glance amongst yourselves before the greed sets in and you hop into the river and start wading up stream. 
It doesn’t take long before you see a cave open up on your right. 
This cave at the river’s edge contains a weathered backpack left by an adventurer who met a grisly end. A crowbar and a 50-foot coil of hempen rope are strapped to the outside of the backpack. Inside the pack are five torches too damp to light, a hammer, a tinderbox, a skillet, a half-empty water skin, and seven days’ worth of spoiled rations. 
Beyond you see a narrow tunnel leading further in

Jhee-Kharr pops everything but the spoiled rations and the pack itself into his own backpack.

He advances up the tunnel, moving silently and listening intently

Perception - 13 

Stealth - 9 

You peek into the next chamber. Slumped against the west wall is the moldy skeleton of a human pirate clutching a rusty shortsword in one hand and a wooden tankard in the other. A shattered wooden cask lies nearby.

Leo follows suit

stealth 26

perception 20

Above the skeleton you spot a groove in the stone roughly the same width and thickness of the rust short swords blade

12

You notice a slight distortion to the north of the room

Leo creeps in and takes the rusted sword. He examines it and the groove. Trying to ascertain if he should use it or if it’s a trap

Survival 17

arcane 12

investigation 3

You see no trap mechanism and can ascertain nothing magic of nature coming from it

Leo looks cautiously at the others here goes nothing and places the sword into the groove 

The sword slots into the groove. a loose rock in the ceiling falls away, and with it comes a moldy old chest.
Both Leo and Jhee-Kharr are distracted by the chest dropping out of the ceiling and do not notice the two Balrugas appearing out of invisibility to attack!

Leo - Attack: 17 Damage: 6 Attack: 20 Damage: 13

Attack: 20 Damage: 9

Jhee-Kharr 

Attack: 15 Damage: 14 Attack: 27 Damage: 18

Attack: 20 Damage: 7

Sig 9

Balrugas 21

Initiative 11

Jhee-Kharr weathers one of the blows due to his physiology

Stone's Endurance - 8 

Initiative - 22 

Initiative 19

Initiative 10