Quote from cyreon >>

The chuul is peppered with two bolts that strike true and get caught by the heavy greataxe, too. It tears up and screeches in pain.

(Minty’s turn.)

Rizo’s death save: 20

 What a lucky roll. But mummy rot doesn’t allow any healing, so Rizo is stable but didn’t get the 1hp and therewith remains unconscious.

for reference, the monster stats: Minotaur Skeleton, Skeleton (duergar skeletons)

Minty takes careful aim at one of the skeletons trying to slow the rain of bolts with one of his own.

Attack: 19 Damage: 10

Sneak damage: 12

Minty’s bolt, by little, doesn’t find purchase in the skeleton’s armor. It, in turn, let’s its own bolt fly towards the chuul.

Attack: 15 Damage: 8

The bolt is deflected by the chuul’s carapace.

(Spark’s and the chuul’s turn)

Spark runs forward to O17 and makes some Magic Stones.  She lets two of them fly at the duergar skeletons (S4, and then S3 if S4 is killed.)  Then she backs up to P17 to try to protect Rizo.

Attack: 12 Damage: 12

Attack: 10 Damage: 13

(Should I roll for the chuul, or does someone else want to?)

Go ahead. Stats: Chuul

The chuul attacks MS1 with its pincers.

Attack: 16 Damage: 11

Attack: 26 Damage: 18

(For reference the Chuul is at 34/74HP.)

The chuul effortless picks up the minotaur with his iron grip pincers and slams its second pincer into the brittle bones thereby snapping the large skeleton's spine! Meanwhile, the Skeletons on the ridge deliver another salve of bolts relentlessly aiming for the chuul. The second Minotaur steps a few steps forward, confused to find resistance on its way forward by a steadfast gnome. Angrily it swings its great axe at Spark.

Xbows: 

Attack: 8 Damage: 12

Attack: 8 Damage: 7

Attack: 11 Damage: 9

Minotaur:

Attack: 18 Damage: 20

Initiative order: 20:S2, 15:S4, 14:Rizo, 10:Minty, 9:S1, 8:Spark, 6:S3, 4:M1

Two of the bolts find a way to penetrate the thick carapace and hurt the chuul. (20/74)

(You're characters might have noticed that the skeleton was particularly vulnerable to the chuul's bludgeoning damage type.) 

Initiative order: 20:S2, 15:S4, 14:Rizo, 10:Minty, 9:S1, 8:Spark, 6:S3, 4:M1

Minty tries once again to slow the incoming bolts with one of his own. 

Attack: 16 Damage: Unable to parse dice roll.

Regular damage 10

Sneak damage: 7

As one skeleton raises its crossbow, Minty’s bolt dislodges one of its shoulder blades. The creature’s arm and weapon slides down into the chasm and the skeleton, unsure what to do, simply jumps after it to retrieve its weapon and appendage. 

Initiative order: 20:S2, 15:S4, 14:Rizo, 10:Minty, 8:Spark, 8:Chuul, 6:S3, 4:M1

Spark runs to O18, risking an opportunity attack from the minotaur skeleton, but letting her make ranged attacks normally.  She uses her sling to launch one magic stone at the remaining minotaur skeleton, makes three more, and then launches another, also at the minotaur.

Attack: 11 Damage: 12

Attack: 17 Damage: 10

She returns to P17, still trying to protect Rizo.

The chuul circles around Rizo to R18 and attacks the minotaur with its pincers.

Attack: 12 Damage: 15

Attack: 20 Damage: 10

(For Spark's attacks, the first damage die is bludgeoning, and the second is lightning.  Her first one should do 18 to the minotaur, but I can't see a breakdown for the second one.)

Edit: The total damage to the minotaur should be between 64 and 69, depending on how much of the damage from Spark's second attack is bludgeoning.

(Hum, I get a total of either 93 or 94, since your roll must be a 4 and a 5 for the color blue. And that kills the Minotaur who had 75 Hp. )

AoO: Attack: 26 Damage: 35

The Minotaur skeleton directs an overhead blow at the fleeing Spark that will be difficult to block or dodge, however, Sparks retribution with some help by the chuul’s powerful pincers make short work of the large skeleton. Three more bolts flit through the air aiming at the chuul.

Attack: 9 Damage: 9

Attack: 21 Damage: 7

Attack: 20 Damage: 6

Initiative order: 20:S2, 15:S4, 14:Rizo, 10:Minty, 9:S1, 8:Spark, 6:S3

The chuul winces as one bolt drives deeply into its soft body between two carapace plates (9/74).

Initiative order: 20:S2, 15:S4, 14:Rizo, 10:Minty, 9:S1, 8:Spark, 6:S3

A ghostly bronze dragon wing appears in the air in front of Spark, temporarily boosting her AC to 23 and blocking the minotaur's axe.

Minty continues returning fire against the opposing archers

Attack: 17 Damage: Unable to parse dice roll.

Regular Damage:  13

Sneak Damage: 14