The Chaos Spawn, now knowing the things ahead of it a threat, barrels along the ground towards the party. As it does so, a stream of slick greenish oil trickles behind it. It rushes in towards Jooor and Mordecai (who make take his readied action after this). The spikes it protruded seem to now seep with some acid as it strikes at the pair.

Pseudopod Strike vs. Jooor: Attack: 5 vs. AC. Hit: 3 piercing, plus 4 acid damage.
Pseudopod Strike vs. Mordecai: Attack: 7 vs. AC. Hit: 2 piercing, plus 4 acid damage.

The spikes seem to be completely ineffective, the pair managing to deflect the blows before they would cause any damage.

INITIATIVE: ROUND 2

23. Chaos Spawn (5 damage)

18: Corseris (14/14 HP)
17: Jooor (16/16 HP, dodge active)
15: Mordecai (18/18 HP, [Tooltip Not Found])
14: Vax (14/14 HP)
14: Warx (16/16 HP)
14: Yolov (12/12 HP, dodge active)
11: Valentine (10/10 HP)
9: Keegik (14/14 HP, Mage Armor active)

Mordecai's attack: 20, damage: 12

(Does Mechanus have sunlight?)

Keegik conjures up a ball of fire on his fingers and slings it at the Chaos Spawn.

Firebolt Attack: 18 Damage: 2(Advantage from Pack Tactics, not at advantage if there is sunlight.)

Vax tosses a Firebolt at the creature.

Attack: 9 Damage: 4

(Yolov has Mage Armor active as well. I casted it upon arrival.)

Pre-Post?

 Yolov steps a little further off to the side, did a few more last minute calculations, and said in sequence. "Angulus. Locked. Trajectoriam. Locked. Ratio. Locked." He tosses the flask into the air, and with a firmly stated," Accelerō!" The flask of oil freezes in mid-air for a moment, and then in a sudden burst of movement goes flying towards the spawn. If Yolov's calculations proved right, the makeshift Catapult would shatter upon impact, releasing its contents all over it.

DC 13 - Dexterity Saving Throw. If failed, both object and creature take: 14 bludgeoning damage. Once covered in oil, the next Fire based damage it suffers will deal an addition 5 points of fire damage. 

Bankahn humphs.

"It appears that this creature has absorbed the acid. I wonder if...it can absorb...this!" he exclaims, raising his greatsword high above his head and chanting a phrase as he plunges the blade towards the creature.

Booming Blade: 5 Damage: 9 slashing and 2 thunder if the creature moves before Bankahn's next turn.

Riposting off of his last blow, Mordecai blinks back the intense light and takes another swing!
Attack: 11, damage: 7

(For all purposes, the plane is generally lit light it would be outside in daylight. It just doesn't use a celestial body, like a sun, to do so.)

Mordecai's readied swing cleaves into the chaos spawn, causing some of it to slice open revealing there doesn't appear to be much in the way of innards. (Chaos Spawn: 14 damage)

Jooor's weapon thrums with thunderous energy, but it seems to deflect away from the spines of the chaos beast, the acid seemingly absorbing the reverberations.

Mordecai's second swing appears to make contact with the beast, but its silvery body appears to have solidified in anticipation, preventing the cleave to cut through.

Vax unleashes a fire bolt into the creature, causing more of it to become molten. (Chaos Spawn: 19 damage.)

Yolov catapults the flask of oil at high speed, hoping for it to strike true and cover the spawn in oil.
Dexterity Saving Throw (DC 13): 13
The chaos spawn seems to sense the oil flask coming towards it, as its body contorts, leaving a hole within that the oil hurls through, smashing ten feet behind it.

Keegik hurls a mote of flame at the monster, striking it as it appears to melt some of the spikes as they glow red-hot. (Chaos Spawn: 21 damage.)

INITIATIVE: ROUND 2

23. Chaos Spawn (21 damage)

18: Corseris (14/14 HP)
17: Jooor (16/16 HP)
15: Mordecai (18/18 HP)
14: Vax (14/14 HP)
14: Warx (16/16 HP)
14: Yolov (12/12 HP, Mage Armor active)
11: Valentine (10/10 HP)
9: Keegik (14/14 HP, Mage Armor active)

Vax took his turn. He launched a fire bolt. 

Coseris not being the best in combat winces as his first attack completely misses the target. As the chaos spawn draws close to Joor and Mordecai and attacks he unleashes another fire bolt as soon as he lets the spell release from his hand, he opens his spell book and starts flipping pages looking for another spell to use. 

Attack: 20 Damage: 8

Hex Damage if hit: 3

Warx delights in the sizzling of the damage his Acid attack does, then gets a puzzled look on his face when he sees the acid dripping from the spikes on the creature.

Switching tactics, Warx moves in a circular route to the side of the creature using the others to distract it as he makes a flanking attack with his whip. Warx moves to within 10' of it, uncoils his whip, and snaps off an attack.

Whip Attack (with Advantage assuming we are using the "Flanking" rule): Attack: 22 Damage: Unable to parse dice roll. 

Damage roll: 3

(Sure, we'll say that Flanking rules apply)

Corseris hurls another mote of fire, which the chaos spawn once again avoids.

Warx moves around and begins to unleash the agile attacks with his whip, lashing a couple of blows into the back of the blob. (Chaos Spawn: 23 damage.)

INITIATIVE: ROUND 2

23. Chaos Spawn (23 damage)

18: Corseris (14/14 HP)
17: Jooor (16/16 HP)
15: Mordecai (18/18 HP)
14: Vax (14/14 HP)
14: Warx (16/16 HP)
14: Yolov (12/12 HP, Mage Armor active)
11: Valentine (10/10 HP)
9: Keegik (14/14 HP, Mage Armor active)

Coseris after looking through his spellbook shuts it and puts it away, shaking his head taking a deep breath pulls his light crossbow from his hip, with both hands steadies his aim and with another deep breath pulls the trigger, shooting a bolt at the spawn. 

Attack: 11 Damage: 8

Hex damage if hit 6 

**EDIT** Forget this turn, Just realized it's not a new round of combat. If it goes into a thrid round use this turn in that place. 

Valentine keeps to herself while looking at this fight, figuring out what to do when the ooze is slain , she simply just shrugs and look around but standing still. Being the one on out look could be the one keeping the group safe as her drow ancestors told her as she hum to herself a child song.  

Perception:  14

Valentine keeps back again, still restraining from involving in this combat.

The Chaos Spawn, now surrounded by several of the mages, appears to lash out on all sides with the spines. Some are coated in acid, while others are hot to the touch.

Spines vs. Jooor: 11 vs. AC. Hit: 2 piercing, plus 2 fire damage.
Spines vs. Mordecai: 4 vs. AC. Hit: 1 piercing, plus 3 acid damage.
Spines vs. Warx: 14 vs. AC. Hit: 3 slashing, plus 2 fire damage.

One of the spines lashes out, a whip-like tendril striking Warx unexpectedly. (Warx: 10/16 HP)

INITIATIVE: ROUND 3

23. Chaos Spawn (23 damage)

18: Corseris (14/14 HP)
17: Jooor (16/16 HP)
15: Mordecai (18/18 HP)
14: Vax (14/14 HP)
14: Warx (10/16 HP)
14: Yolov (12/12 HP, Mage Armor active)
11: Valentine (10/10 HP)
9: Keegik (14/14 HP, Mage Armor active)

Bankahn huffs in frustration, muttering his spell again as he slashes at the slime with his greatsword.

Booming Blade Attack: 20 Damage: 13 + 7 thunder on movement by the slime.

Not at all happy about taking Fire damage from the creature Warx lets out a guttural growl and creates an Infestation of insects to harry the creature.

Creature must make a CON saving throw, DC-13.   Fail = 1 Poison Damage and move 5 feet in a random direction (3 : 1 = north; 2 = south; 3 =east; 4 = west)

Vax tosses another Firebolt at the creature and he will use his movement to get out of the path of the Infestation if he's in that direction.

 Attack: 7 Damage: 7

Feeling the creature's acid hit his armor with a hiss, Mordecai repositions his footing and holds out his hand. Wispy green tendrils extend from his hand and strike out towards the creature as he mutters under his breath, casting inflict wounds.

Melee spell attack: 11

damage on his: 10

"A small miscalculation. Time for some manual adjustments." Yolov walks over to whatever open space he can find in the mass of bodies, tapping his staff on the metallic ground. By the third tap, his staff contorts until it is perfectly uniform, and visibly radiating a static, grey transmutation energy. "Away with you, corruption." He says in monotone while bringing the [Tooltip Not Found] down on the Chaos Spawn.

Attack: 18 Damage: 10.