Daventry shouts, "I know! The entire camp heard that, no doubt! Gonna need one of you to toss me my bow!"

She will use her unused movement to trudge towards the last remaining Pureblood in the muck, or back to collect her bow if Ludolf killed her...

"Gods damn I hate swamps!"

Ludolf's eye beams both slam into the remaining Pureblood and she drops to the ground, very dead. 

You are out of combat for the moment but you have mere seconds to come up with a plan before the second patrol converges on your location. The patrol is approaching from the south west you also know the ground directly to the west is covered with snakes that are acting.... oddly. 

While still messaging Edgar for updates on enemy movements, Ludolf uses his eldritch magic to create an image of a bush like the ones he has seen on his way here and hides inside it after motioning for the others to hide too.
Cast Minor Illusion
Stealth: 4 + Guidance: 2

"How many more are there?" Triäsa asks. "It would be nice to find firmer ground to face them on."

"The other patrol consisted of two snake women and two snake abominations I think" Ludolf quickly responds. "And I'm not sure there is any other ground to be found around here."

(I nearly choked on my burrito at the image of Ludolf jumping in an illusionary bush)

Edgar confirms Ludolf's statement the other group consists of 2 Purebloods and 2 Malisons. A quick scan of the landscape also confirms all of the terrain on this side of the river is this dense swamp. 

In addition Edgar notes the snakes are coordinating their movement the giant mass of hundreds, no thousands, of snakes are squirming slowly to the north and to the south creating a large line from north to south. There is movement from the Pond Mother's house and three shockingly human appearing figures have exited the building.

Pardot calms himself quickly and following Ludolf's lead, tries to duck behind a building to stay unseen from the incoming attackers.

stealth: 25

Daventry grabs her longbow and some extra arrows (poisoned?) from the dead yuan-ti and sprints up to one of the huts closest to where her friends hide. She tries to climb up to the roof, lying flat on the northeast side facing to the southwest, holding her bow horizontally to keep a low profile.

(The idea is to be prone and hidden on top of the hut and mask most her body by lying on the incline, so her feet are northwest and her head and the bow can just barely pop over the raised center of the hut overlooking the southwest... Hopefully getting half or 3/4 cover and forcing disadvantage)

She readies herself to volley the first snake person she sees, no matter the range... She will pepper the bastards with arrows as soon as she can, given the new stockpile she grabbed from the purebloods. She breathes deep, and feels her wounds close. 

Lay on Hands: 9

Stealth: 19

Readied Attacks: Longbow at any Yuan-ti she sees within 600 feet.

Perception: 18

The other patrol is two rounds away. I'll give you all one round to get to your positions/hide whatever it is you are planning to do. Daventry can have 3/4 cover on the roof and will get one free shot at the patrol if you so choose. You quickly scoop up 10 arrows that have a bit of the black venom on the tips. The three humans that came out of the Pond Mother's house are also two rounds away. 

Daventry is on the roof full sniper mode

Pardot is hiding behind a building

Ludolf is sort of hiding in a fake bush... (I am still chuckling, you can have inspiration :) )

What is Triäsa plan?

Daventry you can take your shot anytime, there are two PBs and two Malisons or you could shoot at the random three people coming from the hut.

Once I know what everyone is doing I'll move you on to the next bit.... 

Once she sights in the first pureblood from the patrol, Daventry lets loose two arrows in quick succession from her hiding spot, shouting at her friends, "Be ready, here they come!"

(Rolled with advantage for stealth)

Attack 1: 20 to hit, 10 damage

Attack 2: 24 to hit, 11 damage

With enemies evidently approaching, Triäsa finds a spot near to Ludolf and using Minor Illusion herself she will duplicate his effort and making a bush to hide behind. "So, nobody is going to comment on those humans coming from the hut?  Who do you suppose they are? Is it not odd they are out here in the swamp with the yuan-ti?"  She tries to a glimpse at them and some idea of who they might be while waiting for anyone to get close enough to target. (Stealth: 7, Investigation: 16)

"I think the humans might soon reveal who they are but since they are not prisoners I can only assume they are in league with the evil Yuan-ti." Ludolf responds from his exotic shrubbery with small red flowers, then briefly using the sight of Edgar to take a closer look at the humans.

Perception if needed: 3

As soon as he can spot a Yuan-ti within 120 feet a blasts away, if within 90 feet he also places his hex there.
Eldritch Blast: 23 Another roll if advantage: 9 Force: 11 Necrotic: 3
Eldritch Blast: 24 Another roll if advantage: 24 Force: 11 Necrotic: 4

(Thanks but already had inspiration, will try to remember to use it :-)

Daventry seems too concerned with killing the big snakes about to murder her in the next few seconds to worry about non-snakes who might not murder her in the next few seconds, as she nocks another arrow and calls out targets from her perch. 

Ludolf's and Daventry's might and magic sing through the air and crash simultaneously into the first approaching Pureblood dropping her to the ground dead. The Malison's hiss as they draw their weapons and make toward your position finally entering the map. 

The three humans move quickly and easily through the swamp, the snakes part for them as they pass quickly making their way to your position. The line of snakes bends at the tips forming a hissing creeping C-shaped mass of reptiles.

The three humans are rather unremarkable to Edgar. An old man in the center with a full long, white beard, a red headed women and a dark skin man. Very plain in appearance with deep green robes. The younger man carries a large battle ax and longbow while the old man and the women have a dagger and staff.

The old man calls out to you all, "Their coming was told by the star! They shall be the final sacrifice to our Lord! Show them the power of the Old Empire!"

As he speaks the last of these words the two accompanying him let out a hiss that is most certainly not human. Their skin melts from the faces, dried and dead they shed any semblance of a human appearance. The meat suit falls to the ground revealing creatures which are completely snake

Initiative Rolls:

 Map (Let me know if you wanted to be somewhere else)

 Lizardfolk

Round 1

The Old man waves his hand, "Unimpressive!" As he casts Dispel Magic on Ludolf and Triäsa's bushes which awkwardly disappear (He was unfortunately not fooled....)

Unafraid the Priest slides forward 30 feet through the snakes. He fires an acid arrow at Ludolf, no longer in the cover of his faithful bush

Acid Arrow Attack: 25 Damage: 12 (On a miss you are still splattered with acid and take half damage.)

Similarly, the Warrior move forward with it's longbow drawn given the distance. He takes two arrows and spits a very dark, black venom on the arrowhead and fires both arrows, one at Ludolf and one at Triäsa. 

@Ludolf:

Attack 7 Damage: 11 on a hit DC15 Con Save or take 9 Poison damage, half on a success.

@Triäsa

Attack 7 Damage: 6 on a hit DC15 Con Save or take 13 Poison damage, half on a success.

The Pureblood charges 30 feet northeast along the diagonal. Not quiet in melee range she levels her shortbow at Ludolf firing an arrow

 Attack 5 Damage: 4 + 10

Daventry, Ludolf and Triäsa  are up

Combat Tracker:

1. • Old man
   • Priest
   • Warrior
   • PB
   • Daventry
   • Ludolf
   • Triäsa  
   • Malison 1
   • Pardot
   • Malison 2

From her perch, Daventry pivots and levels her longbow at the other pureblood, hoping to pick off a minion as quickly as possible.

Attack 1: 18, 6 damage

Attack 2: nat 20, 17 damage

(Ok, so ignore my OOC post, just go with what's been done.) 

(Triäsa CON Save: 5)

(Well not quite dead! Yet.) Triäsa tries to attack the same pureblood as Daventry, casting Force Bolt. (One of the malisons if Daventry has already killed the Pureblood.) 
(Spell Attack: 20 Damage: 5 force)

She then makes the slow retreat back towards the building, moving 15 ft. 

Ludolf Con Save vs Poison: 18
Concentration check: 5
Concentration check: 12

Ludolf blasts the pureblood and runs away, heavily wounded, hiding in a prone position behind Pardot and behind the hut, hopefully in full cover now, regretting the silly trick with the illusion.

Eldritch Blast: 14 Force: 7
Eldritch Blast: 10 Force: 15