(Sorry, Pud: that 2d6 roll is 6.)

Elkhorn, badly burned, is barely standing. Strongheart isn't much better off.

Elkhorn tries to shake it off. (Second Wind) Then he charges the Jabberwock with a loud battle cry.
Longsword Attack #1: 21. Hit: 12 slashing damage.
Longsword Attack #2: 6. Hit: 5 slashing damage.

Titaani may act next. The Jaberwock continues to burble angrily.

Ben, Horatio, and Pud should make a DC18 Charisma saving throw. On a fail, roll a d4 and a d8... (Strongheart: 10 4 3)

Annoyed by Elkhorn, who gives it another deep slash, the Jabberwock slashes back with one claw:
(Legendary Action) Rend Attack vs. Elkhorn: 4.  Hit: 24 slashing damage. 

Titaani is up!

Ben:

Dexterity Save:  14

Charisma Save:  19

Dex save: 21

Cha save: 3

Pud tucks and rolls dodging the beast. He lands on his  feet and continues to shield himself.

D4: 3

D8: 8

(( Horatio Charisma Save 11 w/Ben's aura, I don't think he gets a Dexterity Save if he is frozen, does he? ))

(Horatio's not frozen, just confused and zoned out. A five-foot-wide line of fire might wake him up. I'll allow Horatio a Dex Save!  Also: roll a d4 and a d8.)

To summarize:

Titaani is up next. She is in the hallway with Matilda and now Mercion (unless she decided to contest Matilda's attempts to drag her out of the room.)
Ben is up as well.
Horatio and Pud look a bit confused.

Strongheart is hurt, confused, prone, and has an aurochs atop him.
Elkhorn is seriously injured from the jabberwock's fiery gaze, but bravely and unhesitatingly continuing to fight.
Mercion is looking a little more clear-eyed, if still looking a little baffled as to what's happening right now.

The jabberwock is injured, with three serious slashes, but it is still strong, and very angry.

Ben:

Assessing the situation, Ben says, “It is too late to run now!  Work together to take it down if you want to survive!  Heal the injured or stop its vocalizations if you can!”

He takes another pair of swings with the Flaming Longsword, trying to damage it enough to stop that strange rambling that seems to be causing so much discombobulation!

Flame Tongue Longsword:  Attack: 22 Damage: 12

Flame Tongue Longsword:  Attack: 18 Damage: 16

Divine Smite on a hit (level 2 spell):  17

Ben:

(If a second divine smite is possible with a second hit, here is one using a first level spell slot:  14 )

Titaani runs to the door, poking her head out and shooting two eldritch blasts at the jabberwocky: 

Blast one: 20 Damage: 9

Blast two: 21 Damage: 4

Matilda was absolutely livid.......why were they trying to fight a Dragon! We had enough trouble with three crabby old ladies......

" Uh, Wizard Person. Stay here, I think your friends are dead now....Sorry. Um, the owls name is Bloody Beak."

She moved up to Titaani and grabbed the unicorn horn from her throwing it to Mercion.

" Touch the owl with the horn and say its name.....ask it if it knows anything about the dragon and how to get rid of it.......oh, and try not to die like I'm about to."

She then dashed out the doors as far towards the dragon as she could, " Hey, Lizard Breath. Over Here!" 

(  Move up to Titaani.  

Action- Take Horn from her and throw to Mercion.

Bonus Action- Dash into the room towards the Jabberwocky.)

Titaani races back and lets loose two beams of crackling purple energy, the first of which strikes it.

1 The Jabberwock flicks its tail at Ben:
(Legendary Action) Tail Attack vs. Ben: 10. Hit: 8 bludgeoning damage.

Matilda turns and chases Titaani back to the ballroom doors. (Does Titaani contest Matilda's attempt to take the horn?) Then, she runs into the ballroom.

Meanwhile, Ben cleaves into the Jabberwock twice, to devastating effects. The beast is barely upright.

Horatio, eyes wide, attacks Ben.
Horatio: Unarmed attack vs. Ben: 15. Hit: 8 bludgeoning damage.

Pud, mouth open, runs out of the room to the north, and around the corner.

Mercion (unless Titaani wants to hang on to the horn) disappears to the east with it.

Strongheart, still looking confused, chases Pud, and swings at him with his shining longsword.
Strongheart Steel Attack vs. Pud: 26. Hit: 10 slashing damage.

The Jabberwock, deeply in pain from multiple wounds, slashes wildly at Ben:
Rend Attack #1 vs. Ben: 28. Hit: 19 slashing damage.
Rend Attack #2 vs. Ben: 16. Hit: 19 slashing damage.

Elkhorn tries to cover his ears from the burbling. DC18 CHA Save: 2 

(Whoops, sorry - bad roll at the top of that last post. Trying again:)
(Legendary Action) Tail Attack vs. Ben: 14. Hit: 8 bludgeoning damage.)

Also the critical hit on Strongheart's Steel Attack vs. Pud: +6

Also some rolls for Elkhorn: 1, 8

Elkhorn's eyes glaze over, as he does nothing.

Titaani, in the doorway, may act!

Ben, Horatio, Pud, and Matilda should make a DC18 Charisma saving throw. (Horatio and Strongheart get a +3 from Ben.)
On a fail, roll a d4 and a d8... (Strongheart: 20 4 5

Titaani, somewhat overwhelmed, doesn't contest giving up the horn. Instead, she throws her boomerang with all her might at the jabberwocky: 

To hit: 17 Damage: 7

(( Horatio Charisma Save = 0 (1-1), d4 = 3, d8 = 5 ))

Cha save: 1 (2-1)

d4: 4

d8: 4

Matilda Charisma Save- 10