Thodek would light his torch and lead the way, praying for Moradin's aid in their upcoming endeavor. 

Nicholas loads his pistol, then lights a torch of his own before following after Thodek.

Syvis keeps an unlit torch in hand and slinks off to a side wall of the cavern to stick to the darker corners of the grove and keep watch as they begin their purge.

Stealth 24

Shishakli tries to stay in the dark to stay hidden, and flanking around from Syvis pulls out his bow to watch for any dangers.

^ Jimjar also hides with Shishalki and Syvis at the edge of the terrace, his crossbow ready. 

Thodek and Nicholas lead the charge into the Garden of Horrors while Syvis and Shishalk as well as Jimjar lurk in the shadows, prepared to shoot at a moments notice (all are successfully hidden).

As Thodek and Nicholas crest the terrace, torches in hand, the heads once again give mangled screams of pain mixed with pleading. “Th-thank y... you. Y-you came... b...back.” The Drow head that previously spoke, again murmurs in a strained gasp. However, the heads slowly turn, their moans taking on a new tone of fear as something moves across the foul ground. “He-help... me!” The head once again chokes out with its last bits of energy. A disgusting larval creature rises up before you, showing only vestigial fungal growths that hint that it might once have been a myconid. It slowly lurches across the earth, crushing several heads as it moves through the garden, each giving chilling cries accompanied by the sound of squelching flesh. 

“Welcome, travelers.” The aberrant myconid’s voice gurgles and spits as it speaks both aloud and in your minds at once. “Are you here for the wedding rehearsal? Friends of the bride or her intended? No matter! Let the love of the Great Seeder embrace you as you become one with her chosen, the Great Body!”

Thodek and Nicholas now stand about 20 feet in on the terrace, torches in hand and standing at the front of the heads. There are around 20, spreading backwards about 10 feet to where this new mutated myconid creature now stands. Syvis, Shishalki, and Jimjar are all about 30 feet away from this showdown in the Garden. Also, it is necessary to note that the garden does seem to extend back past this, but you can’t make out much due to both the distance and conditions of sight in this area. Each of you feel free to make a surprise attack, and please roll initiative! 

(I did my best explaining the battle situation, but please let me know if you have any questions, or if a battle map is necessary because I am happy to make one if needed.)

What would you like to do?

Not hesitating, Shishakli immediately, and silently, looses an arrow towards the evil creature, as it flies he marks the creature in his mind, and looses another arrow just as the first finds it's mark. He then moves around the area attempting to stay in the dark, knowing that will keep him hidden.

Initiative: 15

Syvis takes her time as her companions spring into action, studying this new creature's movements and trying to ascertain its capability and level of threat.

Bonus action: Insightful Fighting 20 vs creature's deception
Action: Crossbow Attack: 8 Damage: 7 Sneak Attack: 9

And she'll hold her position, confident the others will keep the beastie distracted.

Thodek initiative: 4
(A map could be handy, but I think we should be good for now?)

Thodek drops his torch and raises his warhammer, infusing it with the flames of the forge of Moradin himself before moving forward and swinging at this foul creature.

Bonus action: Searing Smite
Attack: 6 Damage: 5+2 fire if it hits. Also if it hits, DC 13 con save or 4 more fire damage.

Nicholas Initiative 6

Nicholas steels his nerves against the sight before him. Gritting his teeth he takes aim with his pistol and fires at the foul creature.

Action: Attack: 23 Damage: 6

Jimjar Initiative: 16

Jimjar takes aim with his crossbow as well, letting a bolt loose towards the bulbous monster.

Attack: 17 Damage: 10

The attack sinks into the creatures flesh, but beyond the shaft sticking out of the shoulder, there is no indication of its effect (-10hp).

Shishalki also takes aim, loosing  two arrows that both make squelching contact with the creature who does not seem to even flinch at the contact (-24 hp (Total: -34 hp)).

(Yes, due to the fact that Shishalki is invisible in darkness, he maintains advantage on his attacks.)

Syvis spends some time analyzing the creature as it slithers towards the party (Deception: 8), successfully understanding its capabilities. She then shoots a bolt that makes sickening contact again (-18 hp (-52 hp)).  

Thodek raises his Warhammer, charging towards the creature, and it begins to burn with holy fire as he brings it down on the fungal creature with a crack (Con. Save: 11) (However, the creature will use its singular legendary resistance to succeed.) the flames seem to take over, but with a moan, the creature pushes them back, but is still beginning to show signs of fatigue (-9hp (Total: -61 hp))

Finally, Nicholas takes a shot that blows off a section of the creatures shoulder with a boom as it gives a mangled cry of pain (-6 hp (Total: -67 hp)).  

With this, the creature gives a pained but wide smile, before laughing as it raises a hand. Two heads closest to it give agonizing screams as they are pulled up, rising from the ground. Still wearing tattered Drow armor and carrying shortswords, these now husk like zombie creatures limp forward towards Nicholas and Thodek, fungal growth covering their broken bodies.

Spore Servant Initiative: 5

Scion of Zuggtmoy Initiative: 5

Initiative Order: Shishalki, Jimjar, Thodek, Syvis, Nicholas, Spore Servants,  Scion of Zuggtmoy

Shishalki is up!  Thodek, Syvis, and Nicholas feel free to also queue your actions for round one. For positions, please look to the post above (#1146), with the inclination of two spore servants— 5 feet to either side of the main myconid assailant. (I will work on a map, and make sure to include it in the resource doc by the time I next update the thread.)

What would you like to do?

Thodek will step into the middle of the group, slightly regretting his choice of spells this morning, and send another flaming strike at the creature.

Searing Smite: Attack: 6 Damage: 10+2 fire and a DC13 con save or 4 more fire damage at the start of its turn.

Syvis stays motionless, continuing to rely on the others to draw the monsters' attention. She quickly reloads and lets another bolt fly at the primary target.

Bonus action: Steady Aim
Action: Crossbow Attack: 14 Damage: 9 Sneak Attack: 7

Shishakli, sticking to the dark, starts rotating around the grove to flank the creatures. Focusing on the large creature that he had magically marked, he looses another bolt.

Nicholas takes aim and fires another shot from his pistol attempting to disorient the creature while trying to keep his distance.

Action: Expend 1 Grit Point. Dazing Shot on Scion. Attack: 25 Damage: 13

Shishalki takes aim again, firing true and striking the creature with a squelch (-10hp (Total: -77 hp)).

Jimjar also takes another shot (Attack: 22 Damage: 11)) and it strikes the creature, further wounding it (-14hp (Total: -91hp)).

Thodek takes another swing that crushes into the fleshy creature, drawing a scream (Con. Save: 11) as flames engulf it, the creature succumbing to them this time (-15hp (Total: -106hp)). 

Syvis loads a bolt to her crossbow, firing, but the shot goes just wide, scraping the creatures side but has no effect (Miss).

Nicholas grits his teeth and fires the pistol again with a boom. It blows fully through another section of the creature (Con. Save: 16), dealing damage but does not seem to faze the creature at all (-13hp (Total: -119 hp)). 

At the end of Thodek’s turn, the creature will use a legendary action to reach out for a nearby head. With a moan, the head explodes and the creature gives a satisfied smile as it seems to be reinvigorated by healing 7 hit points (Total: -113 hp). 

Additionally, after Nicholas’ shot, the creature will also use a second legendary action with another flick of the wrist to cause a nearby head next to Nicholas explode in a blast of acid and gore. Please make a DC 12 Dex. Save, or take 6 acid damage (none on a success).

With that, it comes to the spore servants. 
One lumbers over to Nicholas while the second joins the fray and attacks Thodek. Each make a heavy slash with their swords, groaning as they do so.

Nicholas: (Attack: 19 Damage: 5) however, Nicholas is barely able to dodge the slow strike (Miss). 

Thodek: (Attack: 16 Damage: 3) It clangs off of the dwarfs armor with a shower of sparks (Miss).

On top of this, the Scion in its turn will now breath in, drawing energy from the nearby earth before hurling a wave of acid from its mouth. It explodes outwards, engulfing both Nicholas and Thodek in a cone. Please make another DC 12 Dex. Save, taking 13 acid damage or half on a success.

The party is once again up! Shishalki is first, but everyone else may still queue their actions. I have included and updated a map on our resource doc. Please let me know if you may have any questions; if not, what would you like to do? 

Thodek dex save: 22

He takes another firm swing with his warhammer, allowing the fire to continue to burn.

Attack: 9 Damage: 6

DC 13 con save or another 6 fire damage

Frustrated by her poor vantage, Syvis darts around the perimeter of the garden, still sticking to whatever shadows she can find when possible. She gets as far as she dares without missing an opportunity to attack the foul beast and takes aim once more.

Crossbow Attack: 17 Damage: 6 Sneak Attack: 7

And she'll take whatever spare moment she can to scan the area for any hidden dangers or objects that might be used to their advantage.

Eye for Detail Perception: 12

Shuddering at the creatures actions, Shishakli pulls another arrow from his quiver and looses it at the creature, staying hidden in the darkness.