So far you Folks have done 231 points of damage to the Kraken. And we are only just starting the third round!

Yeah the "Horned Beast" is staying.

Concentration: 5 Lost concentration, so no 3 necrotic form hex

Realizing she's been eaten, Felicity panics and casts Thunderwave at 8th level. She will spend 3 Sorcery points to use Heightened Spell and give the Kraken disadvantage on the save.

Thunder Damage: 52

DC 22 Con save, half damage on a pass

Going to spend another Sorcery point for Empowered spell to re-roll some of those dice. Re-rolling the 1, the two 2s, and the 3.

6 2 5 4

That should change it to 46 damage if my math is right.

Kraken CON save vs 22: 27
The Krakens inside open wide for a few moments, giving you some room to move Felicity. Outside the Kraken lets out a bellowing roar as it turns slightly, Suffering 46 thunder damage.

Kraken CON Save vs 23: 34

Unfortunately the Kraken manages to keep you in its stomach Felicity, Seemingly overcoming the pain as the insides once again clamp down around you.

As a Bonus action St.Clair Misty steps to within 30 feet of Imras.

"You seem to be better suited to Underwater fighting then me, This will aid you"

Uses his action to cast Haste On Imras.

At the end of St.Clairs turn, the Kraken spends its last Legendary action to swing a Tentacle at St.Clair

Attack: 22 Damage: 24

The Kraken's tentacle envelops St.Clair who is now Grappled and Restrained.

Back to you Atticus!

Atticus will cast finger of death. 

Con save 21 to halve damage: 54

Bonus action:

Mordenkainen’s Sword 

Attack: 32 Damage: 16

Kraken CON save vs 21: 21

Normally the Kraken can only make a CON save to keep someone Swallowed from damage from the inside. But Im gunna say that if the damage is over 50 on the outside It has to make a save as well.

So it takes the full damage from Finger of Death. 65 points of Necrotic damage
CON save to keep felicity swallowed vs 33: 21

Nat 1 to a Nat 20, what are the odds! Felicity remains swallowed.

At the top of the Krakens turn, Felicity you take 35 Acid damage as you begin to get Digested.

Kraken gets its legendary actions back.

The kraken moves to get Atticus in range as its tentacle pulls him towards its maw and attempts to Bite Atticus.

Attack: 25 Damage: 25

350 points of damage to the Kraken so far, It's looking rough. Blood is seeping into the water and its outer shell looks brittle and broken from the finger of death.

Atticus you just find a place to move and Slink down out of the tentacle before the Kraken can Swallow you. Because of the natural 1 on the attack, I'll say you are no longer Grappled by the tentacle but you are 5 feet away from it.

Back to the top, Imras is up!

His current strategy seeming to be working well so far, Imras doesn't change it up much, stabbing recklessly casting booming blade once again, this time followed with an extra stab from the weapon as a result of the extra speed conferred upon him by St Clair.

Attack: 25 Damage: 18, piercing

Sneak attack: 34 additional piercing damage

Booming Blade: 12 thunder damage on hit, if it moves it takes another 18 thunder damage

Second attack: 28 Damage: 20, piercing

(Sadly the extra attack action isn't nearly as useful on a rogue, since I can only get sneak attack once - though the extra chance is useful if the first attack misses - and I can't use booming blade for that attack)

Imras finds a soft part where the Finger of Death had decayed some of its armor and with two quick stabs from your Rapier, Blood begins to blot the water. The kraken shifts and lets out a groan of pain. It's looking like it can barely move. A total of 69 damage from those two strikes.

CON save to keep felicity swallowed vs 34: 28

At the End of Imra's turn, the Kraken spends a legendary action to attack Atticus with a Tentacle.  

Attack: 26 Damage: 21

The Kraken vomits out Felicity who now floats in the water 5 feet in front of the Leviathan as its tentacle curls around Atticus once more. Atticus you are Grappled.

Felicity is up!

Felicity will swim back 15ft and lift a hand, casting Cone of Cold at 7th level. DC 22 Con Save for half damage -  51 Cold damage

Using Empowered Spell to re-roll those two ones. 2 4  Changing the total to 50 cold damage

(Since the Kraken is so big I figure I can angle the spell in a way so I don't hit any of my allies, but if that's not possible let me know and I'll do something different.)

Kraken CON Save vs 22: 26

((Two nat 20's and two nat 1's on the same day.....rough stuff.))

Felicity, with your sudden freedom from the confines of the Krakens stomach. You move away from the Leviathan and look towards the upper part of the exterior, Angling your spell in such a way that it does no harm to your COmpanions.

Unleashing a Cold the likes of which Freeze the water as it travels to the Kraken. It hits the armored exterior and begins to crack. The Kraken lets out a small whine before the entire top of the Kraken shatters into thousands of icy shards. Atticus is loosed from the Krakens grasp as the tentacles go limp. 

((After Imras attack, It had 4 Hit points left.))

The rush of water surrounds you all once more, The same light from before envelops and blinds you.

You open your eyes and blink to refocus and find yourselves back in the Temple. Full Healed and Spells restored. The Sapphire from the Kraken brazier is now in the one of the 3 empty slots in the DragonBorns.

The Kraken statue cracks and breaks, Sea water flows out of the cracks as the pieces fall to the floor. In place you see a Female Half-elf, Arcane energy encircling her as she summons forth a Blast of Frozen magic into the air. The Kraken replaced by a Statue of Felicity.

You look around and note that St.Clair is no longer with you.

After returning I look over at the statue then at Felicity. “I don’t like the look of that..... hopefully you’re not entombed here.”  

"Goodness, what a dreadful thought! And it seems Mister St. Clair has left us as well."  She'll look at the two remaining statues, "Well, what do the two of you fancy next? Fire breathing dragon or... whatever that creature is."

"Just that much more of a challenge with one less person," Imras says, sounding almost excited.  "I vote we try out the dragon next.  At least we know what that one IS."  With that, he walks over to the dragon statue and lays a hand on it.

As Imras lays his hand on the statue. The air becomes hot, so hot you suddenly have trouble breathing. The sweltering heat from it is almost excruciating as you feel yourself begin to sweat profusely. Your eyes go hazy from the heat and you blink to re-adjust them. 

To find yourself not in the Temple but at the Foot of a rumbling volcano. The Mountain of fire stretches at least 1200 feet high if not more. You see lake of boiling lava all around you, Save for this little stretch of land the three of you are currently standing on. An island in a Sea of fire.

A roar streaks threw the sky as black clouds billow overhead. You have one round to prepare in any way you wish.

Imras you no longer have Haste or Freedom of Movement. The Light Cleansed those effects from you.

"Oh dear... spread out everyone."

Feeling a chill run down her spine in spite of the heat, Felicity will spread her wings and dart 60ft up into the air. There isn't much she can do to prepare against what's coming toward them.

Atticus will cast mirror image