Taran nods, immediately beginning to describe to the Esteemed Vishal and the group an ideal location for setting up a series of traps.

Once there, he gets to work.

Ball Bearings are scattered in a 20 ft by 10 ft line, to slow approach by the North (L2 to L3 then up to O3 and O2)

 
Caltrops are carefully buried under the snow in a 10 ft by 5 ft line to the South (M6 and M7) while the rest of the area is covered by his Oil of Slipperiness in a 10 ft cube.(K and L 7 and 8)

After that is done, Taran takes out his Thieves tools and begins laying two traps, by cutting up his Rope of Mending and unspooling his Fishing Line and hooks.

The first, set right beside the ball bearings is a trip line connected to his Morning Star poison bomb, set to crack it open and flood the area. Space N4 DC: 23

 The second takes two of his Flash Pellets and sets them in the Caltrops, bursting them in a brilliant flash to blind the enemies moving through that area. Space L6 DC: 8

Finally, as it approaches 15 minutes until they expect Jade-lin back, Taran coats his three walloping bolts and two normal bolts in the Oil of Lesser Sharpness and activates the Censer to summon an Air Elemental, which he mentally commands to hide in the smallest crevices in the rocks that it can find (At N5 if it can)

Stealth: 7

You set your traps, and then Jade-Lin lopes off towards the silhouette of the monolith, saying she'll be back in about an hour. A little over forty five minutes after she leaves, you see the light of crystals coming across the darkening field towards you. Suddenly, a spectral blade slams into the scree at G4, and then Jade-Lin appears in a whoosh of brassy sparks. The duergar is grinning, a matching blade to the one stuck in the scree in her left hand as she turns to look at where three humans in orange robes have just run into the space between two rocks. One of them steps on the ball bearings and starts flailing to keep their balance, but the one in the lead hits the morning star trap. Opaque gas starts flooding out of the cracked container, and the three humans start coughing.

Further coughing to the south alerts you to two more robed humans, one of whom was just close enough to be caught in the morning star trap. Ranged out behind the robed humans, you can make out five more figures in leather armor with bows.

Con STs against morning star: 3, 2, 14, 14
Dex ST against bearings: 6

Initiative:

Water soldiers (robes): 21
Air soldiers (bows): 13

Siepha: 14
Jade-Lin: 23
Air Elemental: 22
Taran: 20
Caelius: 14
Akuma: 18
Kaori: 15
Vishal: 6

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

Going this round: Jade-Lin, Akuma, Siepha, Vishal

Morning star triggered (poisoned soldiers at N4 and O3). Ball bearings triggered, O3 soldier is on the ground. Round 1/10 for morning star (until Vish sets it all on fire).

Jade-Lin double range attacks the water soldier at N4, two brassy spectral blades flying out of her hands towards him.

Attack: 13 Damage: 16
Attack: 15 Damage: 6

Vishal and Akuma are up (Siepha will go after you).

Moving fast Vishal sends out a fireball igniting several soldiers and the gas hoping to weaken their numbers significantly 

FWOOOOM. Vishal's fireball ignites the gas!

N4, O3, P4 (gas only): 11, 14, 11
P7 (gas and fireball):  8, 6
S6, V7, U9 (fireball only): 10, 18, 13

P8 and P7 are both badly burned. All three scouts hit by the fireball are also burned. N4 and P4 were burned by the gas.

Once the gas has finished igniting, Akuma grins and gives a quick glance over the battlefield before muttering under her breath, eyes fixed on the nearby rock. "This should be fun..."

In a blink, shadows pour from her arms and engulf her body, leaving nothing but a cloud of shadowed smoke in her place. It hovers for less than a second before darting at a high speed across the gap between the party and the enemies, settling in the dim shadows beside the rock and dispersing, leaving Akuma standing directly in front of an enemy (placing Akuma at m4). Without hesitation, she shifts into a defensive stance before striking twice at the enemy (n4) eyes narrowed with purpose.

Attack 1 (at advantage): Attack: 12 Damage: 9

Attack 2: Attack: 10 Damage: 8

N4 gets hit, but not down yet.

Siepha rubs her hands together, her eyes and fingers flickering with electricity as she exhales sharply, and a column of dust crackling with lightning appears at Q7.

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

Jade-Lin grins and moves to M3, two spectral brassy blades appearing in her hands as she attacks N4.

Attack: 14 Damage: 26
Attack: 23 Damage: Unable to parse dice roll.

N4 goes down.

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

The air elemental is up (Chaos).

Caelius (only slightly forgotten about) lifts a piece of grey sentira. Shadows swirl around Caelius and focuses through the sentira and suddenly, a shadow roughly resembling Caelius appears across the battlefield. Pulsing red, it lets out a horrible, inhuman, soul wrenching, screech terrifying only four of the soldiers.

Cast summon shadowspawn at T4.

Obeying orders, the elemental goes for O3.

Attack: 17 Damage: 10

Attack: 28 Damage: 17

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

P4 goes to M4 (taking an AOO from the elemental) and attacks Akuma.

Opportunity Attack: 9 Damage: 10

On Akuma:
Attack: 18 Damage: 5
Attack: 7 Damage: 4
Attack: 20 Damage: 7
On any and all hits I need a DC 13 Con ST or you'll be stunned until the end of their next turn.

O3 attacks the elemental.
Attack: 17 Damage: 5
Attack: 17 Damage: 8
Attack: 14 Damage: 4

P4 dies jeezum.

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

Taran, Akuma, Kaori and Caelius are up.

The elemental is stunned. O3 is on his last legs.

Watching Jade-lin strike down her current target, Akuma offers a thankful nod before moving forward to offer the air elemental some assistance (moving to O4), unleashing a flurry of strikes on the isolated soldier. 

Bip: Attack: 26 Damage: 6

Bap: Attack: 19 Damage: 4

Bop: Attack: 9 Damage: 9

Boop: Attack: 18 Damage: 8

(If by some chance she kills this enemy, Akuma will move to R5 and all remaining attacks will go towards S6)

Akuma kills the O3 guy and hits S6 twice.

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

Taran, Kaori, and Caelius are up.

Taran had grown used to the howling wind in the back of his mind that was the Air Elemental, directing it with a small part of his subconscious mind.

As the explosions ripped through the enemy ranks he took a deep breath, stepping into the flow, and gently squeezing the trigger of his crossbow. A flash of yellow, a fwip of feathers cutting through air, and the bolt flew straight towards on of the smoking water soldiers.

Then he was down on his stomach, loading the next bolt.

BA: Steady Aim

Attacking Water Soldier at P7, advantage and sneak attack 13   Damage 5 sneak attack 4

DC 10 Strength save vs prone from Walloping bolt

Str ST: 15

P7 is on his last legs and prone.

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

Kaori and Caelius are up.

Caelius moves next to Vishal, extends a hand and claws the air. A skeletal hand flies past other enemies and claws an Air soldier.

Moving to D5 and casting chill touch on S6. Attack: 22 Damage: 13. The target can not regain hit points until the start of my turn.

The shadow's hands grow long claws as it hunches over the soldier next to it, its shadowy spine nearly visible.

Attacking T3. Attack: 26 Damage: 10

Kaori pops out from her hiding place, scooping up a few rocks and pulling out her sling as she takes to the sky, scanning for a target. Finding P8, she coos to herself and steadies her arm, firing two of the rocks at the soldier and hitting him square in the forehead. With a cheerful coo, she swiftly puts her sling away and draws her sword, the blade glowing as soon as it's free of its scabbard. 

Books remembers that the water soldiers were supposed to make Str STs against the lightning tornado on their turn.
Str STs: 2, 11
Damage on fail: 8

Siepha casts blade ward and moves the tornado (precise location will depend on those STs but I'll update the map after this turn).

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

The air soldiers start shooting.

Kaori:
Attack: 7 Damage: 12
Attack: 19 Damage: 10
If any miss, add 7 to attack roll, if both hit, add that to first attack's damage.

Jade-Lin:

Attack: 21 Damage: 5
Attack: 26 Damage: 7
If any miss, add 5 to attack roll, if both hit, add that to first attack's damage.

Vishal:

Attack: 21 Damage: 10
Attack: 8 Damage: 7
If any miss, add 5 to attack roll, if both hit, add that to first attack's damage.

Taran:

Attack: 11 Damage: 9
Attack: 12 Damage: 11
If any miss, add 4 to attack roll, if both hit, add that to first attack's damage.

Akuma:

Attack: 21 Damage: 8
Attack: 7 Damage: 12
If any miss, add 1 to attack roll, if both hit, add that to first attack's damage.

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

Vishal is up.

Kaori crit d10: 4

As arrows fall around Taran, he rolls to the side, twisting so the arrow that hits him only traces a burning line on his side. (Uncanny dodge to turn 11 to 5 damage)

Concentration save DC 10: 13

He maintains the screaming winds in his head, directing the elemental to cover their northern opponents, only to find the elemental still too dazed from the monk's strikes to follow his directions.

Running forward (to I6) to be closer for a heal Vishal says, “Don’t forget about us!” Holding out his chakram and blasting three beams of blue fire into three separate soldiers. The first hitting hard but the other two going wide. 

(All rolls in discord) 

Jade-Lin moves to O6 and does her best to finish P7.

Attack: 19 Damage: 20
Attack: 12 Damage: 6

(Pretty sure P7 won't survive that) The elemental is unstunned, and P8 goes for Vish.

Dex ST against oil: 20

Aaaand falls prone.

Initiative Order: Jade-Lin, Air Elemental, Water Soldiers, Taran, Akuma, Kaori, Caelius, Siepha, Air Soldiers, Vishal

Only 1 water soldier left (P8) and he's prone. Taran, Akuma, Kaori and Caelius are up.

Taran continues rolling, using the cover of the stones to pop up from an different angle and fire his second walloping bolt at the distant Air Soldier being menaced by the Shadowspawn. Then he presses into the stones, relying on his cover.

Stealth Bonus Action: 13

Light Crossbow: 8  Advantage if higher than passive perception: 23  

Damage: 12   sneak attack from ally: 11

DC 10 Strength save vs prone from Walloping bolt