Archy starts running frantically in circles. He drops his knife and draws his Rapier swiping at the swarm, hitting 18 for 8 piercing.

He digs deep taking a Surge of Action, and finding his Second Wind, healing 10 and frantically swiping again, hitting 11 for 10 piercing.

Darnic will use Heroic Healing, or whatever it is actually called, to heal using half of his hit dice! Healing: 21! Wait that’s a 20, 10

With shamrock and club in hand Yrwin casts Shillelagh and starts whacking the bugs. "Bet you. Don't. Even. Taste. Good. FRIED." He keeps on whacking the swarms with his enchanted club. 

Attack round 1: 24 DMG: 10

Attack round 2: 20 DMG: 5

Crit dmg: 2

Willie squeals girlishy. "Ew ew ew!" 
She gets up on her toes and tries to climb on top of rubble to avoid the things. When Ywrin crushes the bugs with his staff, she cries in encouragement. "Get them Yrwin!"

She then waves her hand in disgust, trying to put the nasty creatures to Sleep

Hitpoints: 5d8 (2, 3, 2, 8, 3) = 18

Amazingly, Yrwin manages to crush so many bugs that their numbers thin. Archy manages to kill a handful of these suckers too.

Finally, Willie sleeps the rest of them! All the bugs slowly stop their attack. They will be asleep for one minute, so it will be easy enough for you all to step/crush/light aflame/e.blast the rest of them in that amount of time. Battle over!

A rudimentary glance informs you that these beetles are, well, huge. They are about 5 inches long and 2 inches tall. Needless to say that your shoes, if you step on any of them, are covered in bug goo along with your equipment! These beetles also have large incisors... no wonder they nearly killed a couple of you in their first move.

The rest of this area is yet to be explored.

What do you do?

If we may utilize a short rest, before we continue along the wall to the west.

Yrwin starts slapping his back waving at Willie. "Did we get them all, is it still one on me??..."  About 20 seconds after the last bug is squashed Yrwin "calms down". He turns one of his pockets inside out and palms the bisquit-crumbs bound to be there, pinching them between his fingers and sprinkles them onto his tongue. "I don't like the dark... Should I.. Should I light things up a bit? I think I have just the trick."

 "Yeah, let's get some light in those corners" 

Yrwin snaps four times with an elegant motion, using each of the fingers on his hand to make one snapping sound each in the other hand he holds a small, dried, glowworm (casting Dancing Lights) Four orbs of warm, cozy lighting appear around his waist, orbiting slowly around his kithkin form. "Where do we want 'em cuz?"

Archy just gestures toward the room as a whole. The precision will have to be up to Yrwin.

Yrwin waits for the others input before sending the lights out into the unknown.

Darnic, dusting himself off, moves a few beetles out of the way, “How about down that hall? I’d rather not be eaten alive today.”

Willie suggests that the lights be sent to look along the rubble on the northeast wall, in case any other vermin are hiding.

Yrwin looks at each of his friends, taking their thoughts into his own and sends three of his globes due north-east, north and north-west at once.

"Maybe light up as much as possible." 

He gulps. "Although we cant see in the dark the things hiding there might. So best not be surprised?.." The last word comes out with a rather hesitant tone as he gestures the lights further into the unknown.

Yrwin reveals that...

Northeast and northwest both seem to have more "room" to explore. 

North reveals a dead end in the form of a wall. 

(Purple are the lights that were sent out.)

(Sorry editing, there is just more open space north of the NE light.)

Yrwin looks to the "more experienced" of the crew.

"Lead the way and I'll light the way." 

 "Let's stick near the wall." Archy says pointing to the Northwest.

You press ahead moving along the northwestern wall. There is a pathway that leads out of the Dorasharn Tower to the west. You aren't quite sure where it leads to, but it might be nice to know there are other ways in and out of the Dorasharn Tower when it's time to leave.

Further ahead, you see a ruined structure. Its outer walls suggest it was once a temple. Peeking inside, there is nothing inside but rubble. It could be an alright place to take a long rest, you imagine. 

(Long Rests are 1 hour. A reminder of what we are here for - you are inside the Dorasharn Tower looking for the House Cannith Foundry. Green dot is the temple.)