The arena: Monster killers.

That does not hit. The giant snail makes a slam attack at Dolrik: 17 to hit for 3 damage. 

Dolrik is up. 

Toll the Dead at the riding lizard.

DC 14 Wis Save or 2 necrotic damage. (In Game Log)

Riding lizard save is an 8-it is on the verge of death. 
Giant frog bites at Nadir-5 to hit misses. 
Nadir is up!

Nadir takes a stab at the poisonous snake with her short sword and at the riding lizard with her dagger, marking either if she hits.

Attack @snake: 16 Damage: 9

Attack @lizard: 12 Damage: 2

That kills the lizard and wounds the snake bad. The owl flies in and claws at nadir, 18 to hit for 8 damage. The snake also bites at Nadir. 24 to hit for 4 damage, and nadir must make a dc10 Con save or take 10 poison savage, or half on a success. 
Yoku is up!

Nadir con save 21

Nadir barely fought of the owl, when the snake bit her with dagger like teeth and nudging poison in Nadir’s system. Fortunately, her roughened immune system took good care of the poison, albeit with a bit of delay. She shakes her leg to try and drive out the numbness that the snake bite produced.

Yoku shouts out a word of thanks to  Nadir for downing the Giant Riding Lizard, then moves his sights to the Giant Owl.

(bonus action, move Hunter's Mark to a new target, concentration)

Attack Giant Owl, Longbow , bless, Hunter's Mark: 1 (bless) + 16 Damage: 13

(Concentration save from 6 damage, DC 10, with bless: 2 (bless) + 15, Unable to parse dice roll.

(@Nadir, not that you needed it but, you are Blessed for all attack rolls and saving throws.)

That hits but doesn’t kill! Count is up. 

Count will try to hit the snail with {spell]Green-Flame Blade[/spell] and direct the fire shot towards the snake (assuming the owl isn't close enough):

Attack: 9 plus bless 3 Damage: 9

Quote from Engineered_Beard >>

Count will try to hit the snail with {spell]Green-Flame Blade[/spell] and direct the fire shot towards the snake (assuming the owl isn't close enough):

Attack: 12 plus bless 1 Damage: 12

 4 fire damage to the snake if that hits

The flail crashes into the snail with a sickening thud, and the jumping fire kills the snake!

 The snail retaliates at Count with a slam. 23 to hit for 5 damage. 
Dolrik is up!

Hopefully Dolrik can finish off that owl!

Ok, let’s try. Toll the Dead at the owl.

DC 14 Wis Save or 1 necrotic damage. (In Game Log) big sad 😔 .

Quote from PlotArmored >>

Ok, let’s try. Toll the Dead at the owl.

DC 14 Wis Save or 1 necrotic damage. (In Game Log) big sad 😔 .

 On the plus side, it wouldn't hurt anyone's feelings if it makes the save!

Owl save is a 20 so..

frog bites at nadir with an 8 to hit. Nadir is up!

Nadir retaliates at the frog with a stab of her shortsword and fights off the snail with her dagger.

Attack (Short@Frog): 1 (Bless) plus 8 Damage: 9

Attack (Dagger@Snail): 3 (Bless) plus 14 Damage: 2

Any attack that hits will apply unwavering mark to the target. 

Both hit!

The owl Attacks Nadir with a 13 to hit and retreats again. Yoku is up!