As Margaret, hacks down one ghoul, with a snarl and a hiss, two more takes it's place, (rolls seen on R20) one to the north of her claws at her missing badly, giving Margret an opportunity, to attack it.

 The second one moves to her side, and also tries to hit her with its claws, missing giving Margaret a chance to use Brace due to its movement. 

Both of the above are reactions, you only get one, choose wisely.

Droop

Margret tries an attack but the close quarters gets in her way.
Opportunity attack brace :10 to hit, 13 damage

As the snarls and hisses grow in intensity, Droop began to tremble on the spot. He glances once back in the dark, considering the other hallways for a moment. But once again, some measure of courage finds its way through his system as he takes a steady breath, prior to then rushing back out in the hall loosing wild shot after wild shot in a panic. Then its back around the bend, and trying to make it at least sound as if he was in full retreat.

Movement: 15ft east/to the right on the map.

Action: Not so Sneaky Shots at "grey creature" to the immediate left of Margret. (arrows deducted)
(Short Range, Lethal)Shortbow - Attack #1: 9 to hit, for 5 non-magical piercing. 
(Short Range, Lethal)Shortbow - Attack #2: 9 to hit, for 5 non-magical piercing.
(Rolled from CS)

Movement: 10ft west/to the left of map.

Bonus Action: Nimble Escape to Hide with a 8. 

Droop, in his haste, sends two arrows over Margrets and the grey creatures heads.

Calithor

Btw on Krulls first hit the weapons being on fire does 1 worth of fire damage to the grey creature and Krull, when K.O. first returns the rag and oil disappear.

 Calithor again moves from one side of the corridor, to the other, a radiant flame ascends and burns the grey creature to the north of Margret, the same grey creature, moves thru its friends space, to surround Margret and attacks, but misses, then time focuses on

Rabbit 

Rabbit steps forward again to glance around the corner. She casts Chill Touch, creating a spectral hand trying to attack the creature to the south of Margret. 
(Spell Attack: 25, Damage: 13 necrotic)

She then steps back behind the corner once again. 

The hand gooses the grey creature,  not looking good for it,  it's face turning paler, but it still stands.

Another creature, fills the gap in front of Margret, left by the one that moved south, it attacks

 (R20) ATACK:Claws22 damage: 7 slashing 

 Unless you have some kind of reaction, Margret, take 7 damage, roll a Constitution save, beat a DC10. 

Krull

A barrier of magical force surrounds Margret, effectively blocking the creature's attack: Shield +5ac)

Krull joins the fight by moving closer and with his shield bashing the one on his right trying to knock it down( bonus action shove 25 athletics ) and with K.O attacks the one it's in front of him (first attack 10 to hit for 10 damage and second attack 17 to hit for 7 damage)

Its knocked prone, you have two attacks, this ghoul looks like it's not long for the world.

(I have two attacks but no internet lol)

Two more grey creatures enter the fray, with Krull blocking the way they can't continue to swarm over Margie, but they still attack, stepping into the space of the others already there, but, they don't get a reaction from Margret, who already casted shield, but they both miss their target, not having a hope, of breaching the invisible barrier.   

Now the question is, will our stalwart warrior use the advantage Krull gave her to attack the one prone behind her, and surge toward the ones infront of her with thunderous blade attack!

Margret

Leaving the prone undead for those in the back, Margret pushes forward, attacking with Talon, but swings low, hoping to trip her opponent

Attack with Booming blade and trip attack Str DC 14 or knocked prone:  23 to hit, damage: 13+5 (18)

roll an extra d8 Margaret for trip attack 

Already included the +5

Your at 5th level, with booming blade, on the attack itself, the ghoul takes an extra 1d8=1 thunder damage. 

So with a total of 26 damage the Grey creature splats sending ichor, all over

The grey creature to the northwest of Margaret, attacks her 

(OOC: Sorry to use this thread for this, so I am considered Sorcerer 5 for casting, even though I'm fighter 3/sorcerer 2?)

Con Save for Margret: 22.

(@Shim: Yep! Cantrips scale with your overall level, not your class levels specifically. Which is part of why MC casters can be a bit potent.)