Amari, hoping to conserve some of her arcane power, relies once again on her word of radiance cantrip...

• Word of Radiance (cantrip), causing 23 radiant damage (DC 24 CON save)

Then looking at Ruin, she says, "You have my full blessing to finish this fight."

"Then that is what I intend to do," Ruin says simply.

He attacks the Primal Master twice with his axe...

Greataxe
Attack: 30; Damage: 14 (magical slashing) + 8 (radiant) = 22
Attack: 21; Damage: 15 (magical slashing) + 8 (radiant) = 23

And then for good measure he does one more attack with a quickened booming blade if PM isn't dead yet.
Attack: 28; Damage: 13 (magical slashing) + 14 (thunder) + 4 (radiant) = 31

Hoping Ruin can do the job, Kass backs off of preparing another Disintegrate spell, in case there's anything of value on the body - instead, if the Primal Master still stands, he'll prepare another Defensive Flourish with his Vorpal blade, and attack, while his Celestial ally does as well.

8 from a bardic inspiration die, added as damage to the first attack that hits, and Kass' AC as well.  

Vorpal Scimitar attacks:
Attack 1: 19 Damage: 8
Attack 2: 17 Damage: 8

Bonus Action, offhand attack:
Attack: 28 Damage: 5

Celestial Attacks:
Attack 1: 28 Damage: 17 plus 3 temp HP to Ruin
Attack 2: 19 Damage: 11 plus 10 temp HP to Amari

Amari sends out a burst of divine power, which sends the Primal Master reeling. As the PM tries to regain their footing, Ruin charges in, his axe ablaze with thunderous arcane power, which strikes once, twice, three times, cleaving deep cuts in the Primal Master's flesh. The Primal Master drops to their knee, clutching their legs in pain (considering all the melee damage you have dealt has been to their legs, it's a lot of pain), and then Kass sweeps in, blades twirling and twisting in a deadly web of steel. With a final lunge, he finishes off the Primal Master, a groan eliciting from the Primal Master's lung as flaming blood squirts onto the ground

The Primal Master is now dead!

As you all brush yourself off, your golden amulets given to you by the Old, Crazy Guy (remember him from 7 pages ago?) start to glow, getting hotter and hotter until they almost burn against your skin. As you all react to the burning pendants, the bodies of all three masters rise into the air, floating in midair. The head of the Arcane Master also floats off the floor, rejoining with its owner, the robotic tendrils and wires fusing back together. With a swirling chromatic burst, the three bodies begin to float in a circle, spinning faster and faster, until they burst together with a glorious display of pigment, and fuse into a new form. This monstrous titan floats in the air, three sets of wings flapping from their back, keeping them midair. The figure itself is horrifying, an amalgam of the features of all three masters. 

The amulets glow hotter and hotter, and the voice of the OCG speaks in your mind Use the amulets! Now!

Hot. Hot. Hot. Hot! Hot! HOT! HOT!! HOT!!!

Wripers desperately reaches into his loincloth, the talisman burning some not so nice places! He's about ready to rip the whole thing off and scar his teammates for life when his fingers finally close around the little treat.

It must be time to eat it now! He bites down as hard as he can...!

Kass rips his talisman off and throws it to the ground, and slams the pommel of his scimitar into the center of the amulet, attempting to smash it. 

Ruin grabs his amulet and crushes it in his iron grip.

In unison with the others, Amari dashes her amulet into the stone floor...

Waiting for Evelyn and Amelia, 

The Titan begins to grow, becoming larger and larger, until they stand more than five times as tall as Ruin. Extra appendages sprout form their body, languid tentacles and grasping arms, which wield glowing magical weapons infused with energy. The Titan gets bigger and bigger. 

If you have any hope of defeating it, Evelyn and Amelia need to smash their amulets now!

The Titan grows larger and larger, until it seems to fill your whole line of vision. A glowing rune appears on its forehead, and it roars to life.

As it moves to strike you all down, the smashed amulets glow, and individually send a laser of crackling magical energy forth, striking the massive beast. The lasers burn and char flesh, their very magic disintegrating the essence of the Titan. With a final burst, they send forth a booming pulse of energy, which knocks you off your feet and blinds you for a second.

As your vision clears and you stumble to your feet, weapons and foci in hand to fight the beast. a Figure steps out of the shadows.

They are tall, their flesh pale and pink in the glowing light of the torches which rim the chamber. They wear exquisite clothes, garb of some long forgotten noble line.

With a grin of sharp fangs which glint in the torchlight, they throw out their hands at the Titan, which is on one knee, breathing heavily. Black tendrils of dark, insidious magic burst forth from the shadows, a writhing mass of rotting tentacles that works at the beck and call of this new Figure. The strands of blasphemy fly towards the Titan, enwrapping the heaving beast with melting, rotting chains of anguish and pain.

The floor beneath the Titan turns to liquid shadow, the doing once again of the Figure, who caused it with a simple wave of their hand. With a screech, the Titan claws at the ground with multiple limbs, as the bindings of shadow pull the creature down into the dark abyss.

With a final flourish, as if the conductor of an orchestra, the Figure sends the Titan into the darkness, banishing the massive beast into gods knows what. As the room stills, not a sound is heard, except for the smooth glide of a long silk cloak as the Figure turns towards you "Thank you, brave ones. I have been trapped in this purgatory for too long, my powers not strong enough to defeat the Rune-lords on my own. You have saved me and all the poor souls in this blasted place, and we will all have new life!

"Oh, but I must introduce myself! I am Stalhear, master of soul and desire. What is it that you desire? I shall grant each of you your hearts wish, in gratitude for my freedom. Of course, this must be within reason. No naming yourself a deity. We can't have that, now can we?"

"A silent group, aren't you? Tell me, what is it you desire? I can grant it. In fact, I insist, I must show my gratitude. Come on, tell me"

Quote from Raccoon_Master >>

"A silent group, aren't you? Tell me, what is it you desire? I can grant it. In fact, I insist, I must show my gratitude. Come on, tell me"

 Amelia hops off her carpet once it lowers to a safe distance, slinging her rifle over her shoulder. "Sorry for the silence, I'm guessing the idea of a wish is mighty hard to think through." She seems to think for another few moments, "Personally I'd love to know what the pinnacle of my types of invention is. Maybe a blue print I can make or somethin" she grins

"Ahh of course, take all the time you need. But, let's see, blueprints to your Magnum Opus? How about this?" Stalhear waves his hands, and in them appears a blue scroll, rolled and sealed with a golden seal of some sort of strange insect. He hands the blueprints to the Amelia, then looks at the others expectantly.

Wripers merely stands listlessly nearby. The fight's over. That tallest man thingy didn't taste very good. Scratching an itch on his tail, the kobold's stomach growls and he finds himself wishing for a tasty piece of roasted meat, maybe a fried fish...

Stalhear looks at Wripers, and cocks his head intently for a second, then looks at Wripers. With a wave of his hands, he conjures a gleaming roasted bass, seemingly fresh of the fire, the flesh soft and juicy

Amari steps forward hesitantly and says, "Greetings and thanks, Stalhear. I am unsure how best to take advantage of your gratitude, but..."

She pauses for several seconds before continuing, "...as mighty as my deity Kelemvor is, he cannot grant me access to all spells. Can you bestow upon me the ability to cast mage hand, message, and find familiar?"

(Amari is hoping to pick up the Magic Initiate: Wizard feat)

Kass clears his throat, a curious cross between a purr and a cough. "Stalhear, thanks. I don't like relying on anyone except myself and my close friends, but maybe you can help me do right by the man who plucked me out of the gutter before I got swallowed up by the sewer drain of undercity life. Syldammon, is his name, and he's old and retired, I want him to live comfortably. Retired city guard pay isn't worth a hill of beans, Y'know."

"Ahh, of course. I shall grant your wishes. Oh, and little kobold, do eat your fish, you'll find it quite...tasty" Stalhaer waves his hands, and an orb of magic shoots forth, piercing Amari's chest. She gains the requested feat. With another flourish and a popping sound, he presumably grants Kass's wish. "Anyone else? What about your robotic and small companions here? What do you want most?"

The Kobold digs in, sinking his fangs deep into the head first. Soft roasted skull gives in a mush more than a crunch. The eyes pop, juice spilling from the little guy's maw as he chews. His claws sink in as well, fish grease and drippings sloughing off as he picks up the pace, scarfing down more and more. As the time goes on, he finds himself savoring the juice, the char, and the brine, his tail lashing voraciously. 

[A precautionary con save so the little guy doesn't choke on a bone or make himself sick eating at the speed of light: 15]

The fish is delicious, the best thing Wripers has ever tasted. As he eats the fish, he feels stronger and healthier, the best he's ever felt in his whole life. He gains the benefits of a Heroes' Feast, except the benefits last until the next time he gains or loses a level. The extra max HP he gets is....12