Zyl initiative: 19

Magrea, in true Magrea fashion, had not been paying attention to anything. She had been following behind, making her own fun until Zyl said something about a brownie, catching her attention. It was only then that she noticed the creature and readied herself.

Initiative: 5

(Vanizi Initiative: 11)

Init order:
Spiderdragon: 24
Katarina: 22
Yochlol: 20
Zyl: 19
Davis: 17
Vanizi: 11
Magrea: 5
Vesta?

The spiderdragon and yochlol are 30' above the cavern floor. Seeing that you are threats and not supplicants like the other cultists, the spiderdragon scuttles over and down until it is about 10' away and above you, then opens its maw and exhales venomous spiderlings in a 30-foot cone! (Each of you must make a DC 15 Dexterity saving throw, taking 31 piercing damage and 30 poison damage on a failed save or half as much damage on a successful one.) The spiderlings then dissipate throughout the webbing (in other words, they are not a continuing threat...) 

Katarina is up.

(Yep, now the fairy is pretty hurt and also really mad the spiderlady didn't want her brownies!)

Vesta Initiative - 9

Vesta Dex Save - Nat 20!

Even with a successful save, Vesta is looking pretty hurt.

Davis Dex: 26

[Remember you get +5 to saves if your w/in 10 ft of Davis!]

Dex save: 26

Quote from Mister_Whisker >>

Dex save: 23

Looks like Kat takes half damage... which is still 30.

With a hiss, Katarina launches into a RAGE!!! Wild surge: 4

"Magic infuses one weapon of your choice that you are holding. Until your rage ends, the weapon’s damage type changes to force, and it gains the light and thrown properties, with a normal range of 20 feet and a long range of 60 feet. If the weapon leaves your hand, the weapon reappears in your hand at the end of the current turn."

The surge does basically nothing as she uses infuses one of her handaxes.

"Die, icky spider-dragon thing!" Katarina snarls, thrusting her rapier recklessly at the monster twice.

Crystal rapier vs. Spider Dragon
Attack: 28 Damage: 19 magical piercing + 7 radiant
Attack: 26 Damage: 8 magical piercing + 4 radiant

If either attack hits, it does a bonus 4 magical piercing damage from Sneak Attack (because Kat has decided to be a rogue now... Reckless Attack + Sneak Attack is a pretty cool combo)

Quote from Mister_Whisker >>

Crystal rapier vs. Spider Dragon
Attack: 28 Damage: 19 magical piercing + 7 radiant
Attack: 26 Damage: 8 magical piercing + 4 radiant

If either attack hits, it does a bonus 4 magical piercing damage from Sneak Attack (because Kat has decided to be a rogue now... Reckless Attack + Sneak Attack is a pretty cool combo)

 
Since it isn't factored into the formula, Katarina's first attack does a bonus 4 radiant damage. Kat will spend a charge from her crystal sword to regain a number of hit points equal to the bonus radiant damage she did on that first attack.

Note that attacks have advantage to hit Katarina until the start of her next turn because she is attacking recklessly.

Dex save - 9

Magrea is down

(Natural 1 on first Death save if it comes to it)

(DEX Save: 4)

Vanizi takes the full brunt of the damage. She's heavily wounded but still standing. 

Round 1 (con't):
Spiderdragon: exhales a cone of spiderlings that crawl all over the party, biting them all with venomous injections!
Katarina: rages and wants to attack the creature - but it is 10' above you on the sticky web! (You can keep the rolls as appropriate, but need to know how you reach the thing!)
Yochlol: 
Zyl: 
Davis: 
Vanizi: 
Vesta: 
Magrea: falls to the tiny creatures!

Okay... Kat has a climb speed and she could use Feline Agility to double her movement to scurry up the web.

Got it - I'll spot you the DC12 Strength save to not be immediately stuck, butat the beginning of your next turn you'll need to make that save first =)

Round 1 (con't):
Spiderdragon: exhales a cone of spiderlings that crawl all over the party, biting them all with venomous injections!
Katarina: rages and climbs into the web to attack the creature! (Inflicting a massive 46 points of damage, all told!) 
Yochlol: transforms into a giant spider, and scuttles away from you, ending on the ceiling over 60' away...
Zyl: 
Davis: 
Vanizi: 
Vesta: 
Magrea: falls to the tiny creatures!

As the battle starts, one of the lizards, spooked by the sudden commotion, darts into the space! This distracts the spiderdragon - apparently its instinct to hunt these creatures for food is strong!! This means that its next action will be to capture the lizard and cocoon it for later. The yochlol will stay away and see what happens... You may each take two actions. =)
Map

Zyl takes the search action twice and fails miserably, flying up out of the way a little to look for the piece of rod (12 and 10 perception rolls).

Davis is going to Misty Step onto the web, he wants to be NW of the Spiderdragon so he can melee it, but as close to the Yochol as he can get.

If you want STR for being stuck: 30 (nat 20, after rolling a nat 1, but halfling lucky...)

attack 1: 32 (nat 20) dmg: 17 slash + 6 radiant, will add divine smite, level 2, +28 radiant TOTAL: 51

attack 2: 21 dmg: 14

[If this dragon is a fiend or undead, they take an additional: 36 radiant]

Kat Strength save: 20.

Not sure if I should just post her next turn or wait on the rest of the party.

Seeing Magrea fall, Vanizi casts her healing light on her to help her recover. (Bonus Action - Healing Light for 5d6: 13 hp healed)

She then launches 3 Eldritch Blast bolts at the Spiderdragon. 
(Spell Attack: 31, Damage: 15 force) 
(Spell Attack: 30, Damage: 9 force) 
(Spell Attack: 21, Damage: 15 force) 

(NEXT TURN)

Again Vanizi casts her healing light, this time on herself. (Bonus Action - Healing Light for 5d6: 13 hp)

She then launches 3 Eldritch Blast bolts at the Spiderdragon. 
(Spell Attack: 17, Damage: 10 force) 
(Spell Attack: 14, Damage: 13 force) 
(Spell Attack: 21, Damage: 11 force) 

Vesta reels back in pain from the onslaught of the spiderlings. She grits her teeth and manages to remain standing, although she sees Magrea fall at her side. Luckily, Vanizi is there to cast some healing magic before blasting away at the spiderdragon.

Vesta casts Scorching Ray (4th level), sending five bursts of fire straight at the spiderdragon!

Ray 1: 30 to hit for 10 fire damage (+5 Fire Affinity damage included)

Ray 2: Nat 1, Miss

Ray 3: 27 to hit for 12 fire damage

Ray 4: 15 to hit for 9 fire damage

Ray 5: 17 to hit for 8 fire damage

Then Vesta raises her Staff of Power and uses it to cast Hold Monster on the spiderdragon! It must make a WIS saving throw of 19 or be paralyzed!