Yroc sweeps his green shrouded blade past the zombies that are gathering around him, clawing and pummeling, and as he steps back there's a depression in the ground, putting his swing up and over their heads, though he keeps his balance. 

Sickle, pummelled by the Zombie refocuses, his eyes steeling as adrenalin pulses through his veins, he swings his flame blade in full force, the flame slicing lengthwise down the zombie, it's flesh erupting in flames, but it still stands somehow. 

Silas sweeps his war hammer down onto the zombie, its shoulder cracking and dislodging down its ribs, the body collapsing under the damage.

Badger moves up next to Kasaaptu, launching a ball of fire at one of the zombies fighting Yroc.  It slams into the creature, setting its leg on fire, which issues black greasy smoke. 

Kasaaptu also blasts the zombie fighting Yroc, the purple skull splashing against its chest, bones caving in and cracking under the force, but the creature still stands.

Sir Darak, your action.  (and to be clear, I modified the previous attack on you, it missed since you reacted by casting shield)

Sir Darak Darkhall: Shaking off the Flower's strange effects, Darak watches as Sickle ignites the zombie before him. Amazed to find it still standing, Darak attempts to finish off the undead. He shouts to Sickle and Silas, "Assist Yroc! Their numbers now thinned, I can cover the right flank!"

Action - Attack: 20 Damage: 11 Target: Zombie(7)

Movement - 15ft SE

Bonus Action - Shield Master Shove(Prone) - Athletics: 23 Target: Zombie(8)

Reaction - Shield - Condition: Flower's Attack of Opportunity hits by 5 or less.

Sir Darak smashes the zombie in front of him with his blade, crushing bone and sinew.  The creature falters... (Con: 4) 

And collapses in the jungle. He charges for the other as the vines of the flower creature lash out at him.  Attack: 11 Damage: 11 

 Ignoring its ineffective swipe he leaps over and smashes his shield into the next nearest zombie.  (Str : 12) 

 It drops to the jungle floor, dazed.   The creature swipes at Sir Darak from the ground.  Attack: 9 Damage: 4

The one fighting Yroc tries to strike him:  Attack: 13 Damage: 4

While three more around him stand in confusion trying to figure out if he's a true enemy or not, their fists raised. 

4 - 16

6 - 15

9 - 15

Then everyone make a wisdom saving throw except Badger, as another puff of yellow pollen explodes in the area as a number of yellow flowers open up and fill the air with a strange musky smell.  

The green outer ring means they're prone. White means they're standing. A full red circle means they're down and not moving. 

Sickle

Wisdom Save: 18

Sickle sees a number of zombies swarming Yroc as Sir Darak calle out, and he runs over to try to slash at one with his Flame Blade.

Attack: 16 Damage: 11

Seeing the slender clouds of yellow pollen filling the air and the zombies swarming the ruins, Badger quickly resolves to remain where he is. Gripping his diamond crystal and focusing on the colour yellow, Badger hurls another crackling ball of lightning at the zombies surrounding Yroc.

Chromatic Orb (1st level): Attack: 22 Damage: 20 lightning dmg

Kasaaptu mistakenly thought she was far enough away so she blows on the fumes to try and lessen their impact 18 (Wis)

If possible she will cast bonfire under the flower dmg 2

Hoping the zombie A is close enough to burn as well

And then move into the treeline straight west

Yroc begins laughing almost hysterically as the spirits keep haunting the zombies around him, but the green flames surrounding his blade begin sputtering as the pollen fills the air.

Mechanics:

Wisdom Save: 22

Seeing a horde of undead, Silas will take his holy symbol and raise it into the air to Channel Divinity: Turn Undead. 

Wisdom Saving DC: 12 

Sir Darak Darkhall: Wisdom Save: 20

Having bashed the first zombie to the ground, Darak curses it before striking for its head with his blade. He then moves to engage the next incoming undead.

Bonus Action - Move Hex (DisAdv Str Checks) Target: Zombie(8)

Action - Attack(Adv Prone): 20 Damage: 11 + Hex Damage: 6 (Necrotic) = 17  Target: Zombie(8)

Movement - 5ft E

Yroc slams his blade into one of the zombie he's fighting, the green shrouded blade spilling flame onto a nearby, rather befuddled zombie. The one he's fighting stumbles.. 7 but continues to stand someone, shards of bone sticking through it's flesh.

Sickle leaps over a small stone wall and takes a few steps up a slanted patch and slams his sword into one of the zombies fighting Yroc, the creatures flesh sizzling. 

A blue crackling ball of energy is hurled by Badger past Yroc, slamming into one of the zombies.  Electricity dances up and down it's body and it's fried flesh gives way, the creature falling to the ground.

Kasaaptu creates a fire around the plant and zombie A.  The plant's tendrils curl up and blacken, the plant letting us a high pitches squealing noise as it's vines begin to burn. 

Sir Darak, a dark stalking knight continues to march through the zombies, cutting them down and smashing them to the ground.  He slams his sword into the creature at his feet the blade cutting into the skull and part of the vines growing around the creatures head and shoulders, but it continues to try and claw at him. 

Then Silas raises his holy symbol, an unearthly ringing noise ripples through the air, and almost heavenly aura surrounding Silas.

Zombie 2 save:  11

Zombie 6 save:  17

Zombie 8 save:  17

Zombie 9 save:  1

Zombie A save:  9

Zombie B save:  1

Zombie C save:  13

Zombie D save:  11

The creature at Sir Darak's feet takes a swipe at him. Attack: 5 Damage: 7

The zombie standing in the bon fire and burning wanders over to Sickle and takes a swipe at him.  Attack: 17 Damage: 3

The zombie, somehow still standing in front of Yroc takes a swipe at him.  Attack: 12 Damage: 4

The plant vines and flowers in the region of the fire seem to squirm and push away, a large mass of the flowers squirming away from the fire to the east a few feet.  Then yet again, more flowers open up, spreading musky pollen throughout the whole area.  (everyone except Kasaaptu and Badger, Wisdom DC 11 Save). 

The rest of the undead try to shuffle away.  Sir Darak you can AoO zombie B if you like.  Yroc and Sickle can AoO Zombie 9 or 6 each if you like. 

Sir Darak Darkhall: Swinging his blade at the fleeing zombie, Darak holds his breath as another wave of pollen washes over him.

Reaction - Attack of Opportunity: 16 Damage: 9  Target: Zombie(B)

Wisdom Save: 5

Next Turn:

Wisdom Save: 18

Reaction - Shield - Condition: Flower hits Darak by 5 or less.

The green flames flicker out for a moment, but Yroc does not let that hold him back, licking out his blade at one of the retreating zombies. He coughs through another cloud of pollen as he sets off in pursuit. "You're not getting away that easily!" he growls, once more bringing a green flame alive along the edge of his blade

Mechanics:

Kasaaptu will again target the flower with eldritch Blast

Attack: 13 Damage: 10

The zombie at Darak's feet seems determined to fight on, but Badger doesn't feel confident enough to hit it from this far away, so he continues to aid Yroc and Sickle.

Fire Bolt v Zombie 2 or A: Attack: 12 Damage: 7

Wisdom Save: 15

Silas will charge the Zombie #8 with his warhammer. If hecan't each it this turn, he move what he can and throw a Sacred Flame at it.

Warhammer: Attack: 21 Damage: 9 Bludgeoning + 4 Radiant Damage

Sacred Flame Dex Save : 12 
Damage: 1 Radiant Damage

Sickle

Wis Save: 18

Sickle continues to cough through the yellow pollen, dodging a swinging arm from a zombie, then counters with his fire blade.

Attack: 7 Damage: 7

Sir Darak slams his blade into the back of the zombie which halts, the mystical power causing it to flee ending.  It has crushed bone and torn muscles in it's back from his strike.  Then Sir Darak breathes in the musk, and turns, walking towards the well once more.  As he walks away from the Zombie flailing on the ground, it takes a grab at him. Attack: 16 Damage: 4

Kasaaptu unleashes a blast of purple energy which slams into the vines of the creature, sending flower bits and vines flying. 

Yroc slams his blade into one of the fleeing zombies, breaking its stride as his blade chops its right forearm from its body.  He then moves to pursue it, taking another strike at it breaking it's right hip bone into bits, while green flame splashes over the zombie next to it. 

Badger unleashes a blast of fire that slams into one of the zombies near Yroc, lighting it on fire, a greasy disgusting smoke pouring from it, the smell of rotten bbq fills the air. 

Silas rushes the zombie on the ground, slamming his warhammer into it's skull, crushing part of it. (you have advantage against the fallen foe, but you don't need it...there AC is not good).

Sickle swings his fire blade at his foe but misses, coughing on the pollen.

The zombie on the ground by Silas swings at his leg, trying to bite him. Attack: 4 Damage: 5

The zombie next to Sickle takes a swing at him, his thick nails clawing at Sickle.  Attack: 15 Damage: 8

The zombie near Yroc attacks him.  Attack: 22 Damage: 9, as does the one he's chasing, it turns around and tries to clobber him.  Attack: 17 Damage: 3

The one that had moved away from Sir Darak but then been struck moves over to Sir Darak and clubs him.  Attack: 23 Damage: 9

The other one near Yroc, damaged by the flame, stops fleeing and turns to try and fight Yroc, his hand rising... (will save:  8 )

and then swings at Yroc, deciding he's worth clawing.  Attack: 13 Damage: 7 

The plant creatures, tendrils reaching out, tries to strike Sir Darak. Attack: 22 Damage: 17