Beegred is alarmed to be pinned down. He continues to fight back furiously (and with disadvantage from being prone), hoping the kuo-toa is struck down before it can benefit from having the high ground.

• Sword1 Attack: 11 Damage: 11
• Sword2 Attack: 12 Damage: 10
• Dagger Attack: 17 Damage: 2
• Favored Foe damage (only on the first attack that hits): 3

(Rodolfo is up.)

Rodolfo frantically stabs three times.  The Kuo-toa faints after the first injury.  Beegred stabs into the creature's belly, spilling bile and stomach contents.  The third goes through the neck, ending the creature's life with finality.

(Rodolfo's turn)

Rodolfo does the same approach again - ray of frost at the closest non-prone opponent.

Attack: 15 Damage: 8

Rodolfo aims a ray of frost at the kuo-toa engaged with Orubis.  A little less careful about hitting his ally, he manages to solidly hit the Kuo-toa, who's legs appear to go numb from the cold.

The derro caster next to Thurnir, who is still restrained by the webs, casts sleep in an area only occupied by Thurnir.

• Sleep: 12

Thurnir's adrenaline is pumping and doesn't even feel the spell trying to take hold.  (what a crappy roll!)

At the top of Skamero's turn, he has to roll a DC 14 WIS saving throw against Spirit Guardians.  On a fail, Skameros takes 19 radiant damage, or half on a success:

• Skameros WIS saving throw: 7

(Skameros's turn)

Skameros will continue attacking the kua-toa

[Greataxe: 10 Damage: 15 slashing damage]

[Greataxe: 16 Damage: 15 slashing damage]

And if one of those hits his Divine fury will proc for 6 radiant damage

Skameros lands one solid blow on the Kuo-toa caster.

• DC 12 CON saving throw to maintain concentration: 15
• On a 25 or less, the web breaks and he falls:  88

The Kuo-toa caster retaliates by casting Spiritual Weapon at level 4, followed up by a Sacred Flame.

• Spiritual Weapon attack: Attack: 16 Damage: 17
• Skameros DEX saving throw (w/adv) vs. DC 14: 10.  Take 8 radiant damage on a fail.

The Kuo-toa next to Orubis attacks Orubis twice:

• Bite: Attack: 6 Damage: 3
• Pincer Staff: Attack: 22 Damage: 7

On a 10 or less, giant spiders join the initiative:  75

(Thurnir's turn.  Orubis, Beegred and Rodolfo on deck)

Thurnir says to the Derro next to him “tryna cast a spell on me, eh? Take this!”

He attacks twice with his rapier..

27 to hit 14 damage

27 to hit 8 damage

if either hit, he will use divine smite (2nd level spell) to do an extra 9 radiant damage on one hit.

Thurnir strikes the caster once, a blow infused with his own access to the divine.

• On a 25 or less, the webs break:  11

(Orubis's turn.  Beegred and Rodolfo on deck)

The web the derro caster stands on snaps under the impact of Thurnir's divine smite.  The Derro caster begins to fall and attempts to land...

DC 15 DEX saving throw: 9

The Derro caster lands awkwardly, firmly restrained by the sticky webs.

(Orubis's turn.  Beegred and Rodolfo on deck)

(I will do Beegred's turn out of order, as he is only moving on his turn.)

Beegred tries to move up the rings closer to Skameros, and does a Dash+movement. Survival check vs DC 15: 5

Seeing Skameros in trouble adds precision to his movements, as he moves lightly on the webs (50' total move).
Cross a ring to M2 (12.5'), then to M5 (15'), crosses another ring to M6 (12.5'), then to K8 (remaining 10').

He has sheathed the melee weapons (free action), so he can pull out his bow next round.

Calls out in concern to Skameros: "Either kill that caster right now, or move away. The ranged attacks won't hurt as much as standing next to it."
(I have no idea if Skameros can kill it with the next 2 blows or not.)

Orubis keeps pummeling at his kuo-toa counterpart with mace and spiritual weapon

Attack: 21 Damage: 3 

Attack: 22 Damage: 10 

Orubis connects with two attacks against the Kuo-toa in melee range.

(On a 25 or less, the Kuo-toa ends up prone:  75, 52)

Beegred hauls arse to come help Skameros.  (Will update map asap).

(Rodolfo's turn)

Edit: kicking the dice hamsters...

Rodolfo shoots magic missiles at the <something> Derro Caster at D16 for 9

Rodolfo shoots three magic missiles at the restrained Derro caster, and it falls unconscious.

At the top of Skamero's turn, he has to roll a DC 14 WIS saving throw against Spirit Guardians.  On a fail, Skameros takes 29 radiant damage, or half on a success:

• Skameros WIS saving throw: 3

(Skameros's turn)

EDIT:  Persistent Derro Caster death saving throw: 11

EDIT 2:  Because the forum is being difficult, the results were:  25 radiant damage.  17 for Skameros's saving throw.  17 for Derro's death save.

[Death save: 8]