It felt like not only minds could be eaten. For example, patience was already half-digested if not on the way out, so to speak. "Anything?" asked Lionel in a loud whisper not to interrupt the delicate ritual.

The group settles back, focus' once again on Meepo as he writes his note. The ink along the paper evaporates and slowly a black mist begins swirling about the circle. Meepo feels....a strange pull along his skin where the tattoo is....but the black ink remains solid along his flesh. 

Then a blast of magic erupts from the center, a dark wind of shadows blows away blasting in everyone's faces and sending Meepo rolling out of the circle and off to one side and the ground shakes with a thunderous rumble.  There, in the circle, stands a slightly female figure born of shadows and darkness, with long extended finger and toes and shadows seeping off its body like a cape.  The woman has her mouth open and is screaming in ecstasy "I AM FREEE!!!"  

Everyone roll initiative.  (if you go before Nintra, feel free to take your action)

Nintra: 26

Laffa: 9

Ketch Initiative: 14

Forgot at disadvantage so 2nd roll which will be the one used: 16

I can't see anyone rolling higher than that 26! Especially those of us who are exhausted (initiative is an ability check, right?)

Mordekai initiative: 10

(Yes, correct, it is.  Laffa disadv initiative roll: 15.   I wrote that in the post before seeing the result. :-p  I always write that as part of my initiative posts....) 

Lionel could not beat it even with advantage with his dexterity.

Initiative: 14

(Meepo can't beat her init, so I'll take her action and then Meepo can join in after...) 

Meepo gets blown in 7 this direction. (North is 1, going clockwise from there).

Nintra looks around with a sneer and extends a hand. A storm of swirling black glass shards emerges around a quarter of the room, the glass shredding books, slamming into shelving and cutting up anything it can touch. 

DC 20 Dex Save from Meepo, Lionel, Ketch, Mordekai, 5 skeletons, and 2 zombies, and the bound prisoner (DA).  Take 35 slashing damage on fail, half on a save. 

Bound prisoner : 4

The prisoner is shredded by chunks of glass, a piece ripping right into his skull and killing him instantly.

Then Nintra raises her other hand and the shadowy mirrors at the end of each alcove shimmer, and shadowy elven warriors made of smokey grey glass emerge from each, longswords held ready.  Glass Warriors Initiative : 18 

(Waiting on Meepo's initiative in case he goes before the glass warriors.) 

Meepo was blown 15 feet to the left, outside the circle, FYI. 

Initiative:  Nintra 26 |  Glass Warriors 18 | Lionel 14  | Ketch 13 | Mordekai 10 | Laffa 9 | Meepo ??

Ketch Dex save 15

Mepoo init: 12
Dex save: 12
Skeleton saves...
1 ... 8
2 ... 11
3 ... 20
4 ... 11
5 ... 8

Zombie saves: 1 ... 10
1 ... 8

Lionel Dex save: 13 + 4 Bless (that was declared as an "out of combat buff cast the moment the Princess appears". I think it's legit?)   (Circle is the glass shards, right?)

Don't forget Bless and (for Ketch and Mordekai) +3 from Aura.

No bless as a reaction. You don’t know exactly when she’ll emerge. No reactions or start of combat free responses since everyone (including the princess) knows exactly what’s happening. So everyone would react with triggered actions simultaneously. So, since everyone is aware, it’s just roll init as normal. But, you could cast it near then end of the ritual process and assume the princess is appearing. In which case let’s say you lose 1d4 rounds off the duration for not knowing exactly when the princess is going to emerge in this ritual. 

I don't think Lionel could cast Bless just before the end of the ritual as Lionel is currently grappling Ketch?

(Surely the thing with Lionel and Ketch dissipated before the end of the ritual? They've both got enough common sense to prioritise the Princess over a minor disagreement, no?)

Mordekai DC20 DEX save: 22

He'll also glare and point at Nintra in response, and cast Hellish Rebuke for 8 fire damage (Nintra DC18 DEX save for half damage)

The tussle with Laffa resolves well before the ritual finishes, so that shouldn't interfere with the situation. 

Nintra save vs DC 18 : 32 

Bones clatter to the floor as skeletons bones are shattered by flying glass. Two zombies all drop amidst the chaos. 

Then six glass elven warriors emerge from the mirrors and leap into battle. 

The first, emerging from behind Ketch and Lionel strides forward, aiming for the only remaining, damaged skeleton, and swings at it. 

Attack on Skeleton: 26 Damage: 10

Attack on Skeleton: 16 Damage: 7

Attack on Skeleton: 23 Damage: 19

Meanwhile the one near Mordekai advances on the Tiefling....swinging its longsword. 

Attack on Mordekai: 10 Damage: 18

Attack on Mordekai: 23 Damage: 15

Attack on Mordekai: 10 Damage: 7

The other four advance behind the ring of skeletons in front of them and begin chopping up the undead skeletons....

Attack on Skeleton: 10 Damage: 12

Attack on Skeleton: 21 Damage: 11

Attack on Skeleton: 12 Damage: 8

Next set of Skeletons...

Attack on Skeleton: 18 Damage: 10

Attack on Skeleton: 12 Damage: 16

Attack on Skeleton: 26 Damage: 13

Next set of Skeletons...

Attack on Skeleton: 12 Damage: 16

Attack on Skeleton: 14 Damage: 16

Attack on Skeleton: 12 Damage: 14

Last set of Skeletons...

Attack on Skeleton: 16 Damage: 13

Attack on Skeleton: 12 Damage: 10

Attack on Skeleton: 16 Damage: 13

Lionel is up!

(Meepo, I believe 8 skeletons are down, 2 zombies are down, and 1 skeleton is injured. Leaving 10 skeletons and 1 zombie still in the fight?. 4 Skeletons are not in melee, the other 6 have a melee combatant near them.) 

((If Ketch was released before the end of the ritual, Ketch would have then retrieved his axe and shield and used that distraction to cast Banishment pm Laffa.  Ketch does NOT trust that wizard being free at their backs come whatever does via the ritual...  And if he can hold concentration for a minute then Laffa is back in their home dimension, wherever that is.))

Assuming if after the above Ketch is still close enough to Lionel for the boosts then his dex save becomes 20

(The idea was to prevent/stop the bloodshed, not to keep Ketch forever restrained so the moment it felt like Ketch is not raging anymore, Lionel let go of him. But he kept close, so, aura should work. Bless cut off rounds will be 2)

The fight began suddenly and with devastating effects on their side. "Time to open the door?" Lionel said it while assessing the situation. The Princess seemed too nimble for simple attacks... He tried another approach - a simple direct attack:

BA: Channel Divinity: Vow of Enmity (You can choose a creature you can see within 10 ft. of you and gain advantage on attack rolls against it for 1 minute or until it drops to 0 HP or falls unconscious.)

Attack: Bless 4 + 30 Damage: 17 + 5

Attack: Bless 3 + 25 Damage: 11 + 9 

On Mordekai's turn, he's going to completely ignore the glass warrior, casting Hex on the Princess and sending his Eldritch Blasts at her. 

Attack: 14 Damage: 12 plus 6 Hex damage. 

Attack: 11 Damage: 7 plus 3 Hex damage. 

(I forgot to close dice roller brackets for the attack rolls, which is why the warning came up. Had to go back and edit to close the bracket)

(Hex at 1st level, by the way)

Lionel strides forward. His blade slashes twice at the princess, striking her hard glass like skin and sending bits of glass spattering about.  She glances at him with slight displeasure and then a small explosion of shadows erupts around her and then abruptly vanishes along with her. She appears, 30 feet up, flying in the air above. 

Ketch's action, then Mordekai unleashes his blasts.