Seeing the 2 Meenlocks still coming at him and Triäsa, Ludolf desperately calls upon the powers of his enlightened mind to blast the aberrations to oblivion.
Shatter 10 Con save 15 for half.
He the pushes away any still standing Meenlocks Str save 15

Meenlock 1 15

Meenlock 3 11

Meenlock 3 is hit by the full force of Ludolf's blast, it's uncovered head, drips blood as it shakes violently from the noise and suddenly it's head explodes spraying black blood as the body hits the floor, convulsing and very dead.

Meenlock 1 manages to brace itself against the blast and while injured stands tall and swings it's claws at Ludolf yet again.

@Ludolf Attack 13 Damage 9

On a hit DC 11 Con Save to avoid paralysis

Recharge: 4

Klin and Triäsa you are up

Initiative:

1. 1. Klin
   2. Triäsa
   3. Meanlocks 2 and 5
   4. Pardot
   5. Daventry
   6. Ludolf
   7. Meenlocks 1

    

Triäsa drops her crossbow and draws her shortsword (presuming I can do that without an Action and attacks Meenlock 1. 
(Shortsword Attack: 13 Damage: 2 piercing) 

She gives a brief chant as she gives Inspiration again to Ludolf. (1d6 can be added to one ability check, attack roll, or saving throw) 
'Ludolf the brave
keep up the fight,
and be inspired
whilst in my light.' 

Klin's book slams into the Meenlock's chest. A sickening cracking of ribs fills the air. The creature drops to the ground and it's body turns to a black ichor that melts into the ground. Meenlock 5 is dead.

Triäsa switches weapons with no problem and swings her sword. Unfortunately the creature nimbly dodges out of the way and is unharmed.

Meenlock 2 sees the battle has turned and sensing it may be next detonates the dynamite next to the pillar it is standing at causing another section of the roof to collapse. It then disappears as the others have done . You can hear groaning of the earth above you as the remaining pillars support the weight. Meenlock 2 reappears next to the southwest pillar, standing at L7.

Pardot, Daventry and Ludolf you are up.

"He's trying to bring down the cavern!" Daventry shouts.

She rushes up to the last Meenlock (1) in the north to try and finish him off, so that the rest of the group can focus on 2.

Action: Booming Blade Attack: 7 Damage: 7, on move damage: 3

Hoping to prevent a total collapse, Pardot moves to e12 to get eyes on it before attempting to blast it as he did the last, and then moves back to e13, trying to stay near the entrance just in case.

Pardot's blast crashes into Meenlock 2 spraying black blood all over the pillar. Daventry's strikes unfortunately miss the other creature. 

Ludolf places his hex on the closest Meenlock and turns his gray piercing eyes on it, blasting it with grey crackling force.
Eldtritch blast: 26 Force: 14 Necrotic: 1

Recharge: 2

The ball of force barrels into the creature crushing against the wall. It can hardly breath as blood pours from it's mouth. With little option it sees best chance at survival a tactical retreat. It uses it's action to disengage and moves to A8.

Klin and Triäsa you are up.

Klin's book slams heavily into Meenlock #2 crushing it into the ground. It lies on the dirty bleeding and melting into the ground. Meenlock 2 is dead. 

One left!

Triäsa moves forward going after the creature, obviously bringing her light moving with her.  She draws her dagger as well as she moves.  (Moving to A10.)  After navigating around Daventry and Ludolf, she can't quite keep up with the retreating creature.  She decides to just throw her dagger at it.  
(Dagger Attack: 6 Damage: 4 piercing)

Triäsa dagger flies harmlessly through the air and clatters loudly as it strikes the smooth stones next to the creature.

Pardot, Daventry and Ludolf you got this!

"Wait Triäsa!" Ludolf says as the young half-elven bard follows the fleeing Meenlock. Ludolf runs up by her side (B10) and turns his gray piercing eyes on the Meenlock, blasting it again with grey crackling force.
Eldritch blast: 27 Force: 10 Necrotic: 5

Ludolf's bolt slices the last creature in half it falls to the ground. Dead.

Good Job! You are out of combat!!

As the creature falls the shadows and screams abruptly stop and the cavern falls quiet. Any penalties you might have to perception etc from the beginning are gone. 

Daventry holds her blade up, providing light. "Check that there won't be a cave-in! I'll scan by the entrance... if this was their lair, then perhaps there's something of use, or some proof we can take back with us..."

She looks towards the fallen form of Thavollock. "Sorry, Thavol. Should have kept you out of this... may you share a smoke with Moradin."

She will help someone with good investigation search the lair and the bodies.

"Are you alright Triäsa?" Ludolf asks, checking on her before cautiously investigating the Meenlock nest, assisted by Daventry.
Investigation: 11 :-P

Triäsa leans herself up against the wall, looking rather tired and unhappy.  "I am ready to get out of here!  You think we are done in here?  Oh, wait, we probably should check out whatever those meenlocks were looking at."  She takes a breath. "Got to gather my stuff up too." 

She then looks up at Ludolf. "I am okay, I guess.  Still a few wounds.  I tried to heal myself up some."