30 - Chaos in Halloween Town

[Round 1]
Roba flies into the air, while everything turns dark and menacing:

• Foolish fools, you think you can take the mighty Roba, let's see how you deal when the floor is... lava!

Upon saying that, the pumpkin spits burning seeds, which seems to be lava.
↪[DEX Save] Azzy and Balnorin takes 7 fire dmg, and the rest manage to get on a table in time.
"Reylynn" casts on [Slow] on the Pumpkin and a few Werewolves and a Cyclops (Pumpkin and one werewolf affected), and the targeted Werewolf is under [Sorrowful Fate] (and loses 5 HP)
The creatures take their turn:

• Two Ghosts are doing scary faces...
  ↪[WIS Save - Fail ❌] Everybody is freighted (except Persy using Prophet's Diadem)
• Two Ghosts to "Reylynn" (both miss)
• The Cyclops hurl parts of the big plant to Persy (both miss)
• The Werewolves moves in semi-circle around us, one on "Reylynn" (miss), two on Balnorin (crit for 16 dmg (one hit nullified by [Silvery Barbs]))

Nesvalyn gets closer to "Reylynn" and uses a charge of [Breath Weapon] (for 12 dmg) on the ghosts near her.
↪[WIS Save - Fail ❌] Still frightened.
Azzy gets back their weapon, then attacks one of the ghosts (hits twice for 24 dmg).
↪[WIS Save - Pass ✔] Azzy manages to shake it off.
Persy dashes and get closer to the side of the Pumpkin and attacks it (hits twice HELLA CRIT for 44 dmg) and lava seeds pull out from the hole, and moves away using the Rocket Boots.
↪Roba calls the pumpkin "Behind you idiot, the robot!", which turns surprised, then leans forwards and spits a big green vine at Persy (hits for 12 dmg) and is held in the air.
↪[CON Save - Pass ✔] Persy is still concentrating.
Balnorin casts [Turn Undead] and all the Ghosts turned, then uses the lantern to cast [Blight] on the Pumpkin (fails the save for 64 dmg)
↪[WIS Save - Pass ✔] Balnorin shakes it off.

[Round 2]
The Pumpkin keeps spewing lava seeds.
↪[Contested Grapple check - Fail ❌] Persy is still grappled.
↪[CON Save - Pass ✔] Persy is submerged in lava seeds and take 3 dmg.
↪[CON Save - Pass ✔] Persy is still concentrating
Roba points Balnorin yelling "I can do that too!"
↪[CON Save - Fail ❌] Balnorin takes 43 necrotic dmg.
"Reylynn" activates her [Form of Dread] (clears Frightened condition), then casts [Eldritch Blast] on a ghost (hits for 23 dmg and is Frightened of her)
The creatures' turn:

• The Ghosts run away this turn
• The Cyclops pick up rocks and throws them at Balnorin (miss) and Nesvalyn (miss)
• Two Werewolves attack Balnorin (all miss), two on "Reylynn" (one fully misses, takes 7 dmg and keeps concentration), one to Nesvalyn (gets bitten for 5 dmg - [CON Save - Pass ✔] saves for Lycanthropy), one to Azzy (miss).

Nesvalyn uses a charge of [Breath Weapon] on the Werewolf then Disengages and gets away a bit.
↪[WIS Save - Fail ❌] Still frightened.
Azzy moves away from the Werewolf, then attacks the Pumpkin (hella crit for 120 dmg then hits twice for 46 dmg 💀), making the Pumpkin explode, Roba yells "You ignare ignorants, what have you done? You doomed us all!".
↪ The Werewolf takes an Attack of Opportunity, but fails.
↪ [DEX Save] Only Balnorin is knocked Prone from the shockwave. (all the enemies are knocked down)
Persy casts [Dispel Magic] on Roba, but doesn't fall...
↪[Perception - Fail ❌] He's not sure why he's still flying.
... then Ozzy attacks Roba (hits for 5 dmg), then regains a spell slot using his Spell-Refueling Ring.
Balnorin gets up and casts [Insect Plague] on Roba (for 30 dmg)

[Round 3]
Roba flies out the Insect Plague, being 40ft in the air now:

• You don't even understand what you've done, now that the pumpkin is destroyed, Halloween Town is getting fused with the mortal world!
• Persy: Should've thought before sending it us!

The buildings turn gray and the sky takes even deeper colors.

• Roba: If we must be subjected to the mortal world, we should be destroyed instead!

Lightning strikes him as a catalyser, then it hits buildings, trees, and it points to Persy:
↪[DEX Save - Pass with [Flash of Genius] ✔] Persy takes 11 dmg
↪[CON Save - Pass ✔] The seeds ignites again and takes 10 fire dmg
↪[CON Saves - Pass ✔] Persy keeps the concentration

The Werewolves and Cyclops peel their faces, revealing humans behind, and they run away from the Town Square.

"Reylynn" casts [Hex] on Roba, then casts [Eldritch Blast] (hits twice for 31 dmg)
Nesvalyn aims and throws a dagger at Roba (hits for 22 dmg)
↪Nesvalyn noticed that someone freed the Witches from the Gallows.
Azzy reloads, then attacks Roba (misfires), and fixes his weapon, then moves away.
↪"Reylynn" regains one Bardic Inspiration from [Poetry in Misery].
Persy is standing in fire and takes 6 fire dmg ([CON Save - Fail ❌] and keeps concentration), then calls out Ms. Piper:

• What do you want me to do?
• Save them! We can save Halloween Town!
• Fine by me!

Persy casts [Misty Step] and uses a charge of his Rocket Boots to attack Roba (hits twice for 24 dmg), then expends the last charges to land on a roof.
Balnorin casts [Blindness] but gets [Counterspell], and uses Longtooth’s Trinket.

[Round 4]
Roba hits the ground with his fist, casting a destructive wave around him.
↪[CON Save] Nesvalyn and "Reylynn" takes 13 dmg, Balnorin takes 25 dmg and is Prone.
"Reylynn" casts [Eldritch Blast] (hits once for 9 dmg) and uses her [Second Wind] to heal 11 HP.
Nesvalyn aims and throws a dagger at Roba (hits for 24 dmg).
Azzy moves away and attacks Roba (hits thrice for 84 dmg 💀)