The arena: Monster killers.

Nadir stabs at the broom, which had bumped into her violently earlier.

Attack: 15 Damage: 6

That misses the broom. 
the Anarch makes a spiked club attack at (1-count 2-sir spitz) 2
Attack: 17 Damage: 6

Dolrik is up. 

Toll the Dead at the broom.

DC 14 Wis Save or 1 necrotic damage.

Broom save: 15

(Nat one on the brooms part. I count a nat one on a save as the same as receiving a critical hit from an attack so…double damage! Extra damage: 11

Abyssal wretch is attacking Dolrik: Attack: 23 Damage: 12

petregrins turn, the broom went down

Peregrin is taking a stab at the abyssal wretch: Attack: 26 Damage: 18

cunning action hide: 15

Count is up

Count will cast Booming Blade and swing the flail at the abyssal, Sir Spitz will disengage and move 30' away:

Attack: 12 Damage: 7

Shoot, that misses. 

Nadir is up!

Three is the charm. Another attempt on the Abyssal Wretch, this time by Nadir's Spear tip.

Attack: 16 Damage: 5

Additionally, Nadir tries to recover some strength, "We've got them cornered! Almost there!"

BA Second Wind: 11 HP

Quote from Engineered_Beard >>

Count will cast Booming Blade and swing the flail at the abyssal, Sir Spitz will disengage and move 30' away:

Attack: 12 Damage: 7

 Actually, this does got! Sorry, I looked at the wrong stat block. With both your attacks, it’s starting to look wounded. 

The Anarch makes a spiked club attack at Nadir: Attack: 23 Damage: 5

Dolrik is up!

*Damn, Nadir just keeps getting targeted.*

Seeing the abyssal sheathed in Booming Blade energy, Dolrik instead points his finger at the Anarch and casts Toll the Dead.

DC 14 Wis Save or 6 necrotic damage.

He then steps 5’ away from the Abyssal (granting an attack of opportunity) but hoping to force it to move, thus releasing the booming magic.

Anarch save: 2

The abyssal takes the opportunity attack and again falls for it: Attack: 11 Damage: 6

Booming blade damage: 5

Attack: 13 Damage: 8

and a Peregrin is up $

Peregrin attack at the Anarch: Attack: 14 Damage: 14

and hide check: 22

Count is up!