Soar, please make a CON save.

This is for the most recent hit right? You saw the what I assume was successful first one?

CON save: 18

No, this is for something different.

Soar, you feel the magic of Nate's healing word come into you, but then there's an echo, or perhaps an aftertaste, of the necrotic energy you felt from Rezmir's sword, and the healing magic fades away.  You don't heal anything from Nate's spell.

Nate, you run out and west.  From where you are, you don't see Jos.

The two drakes are attacking Bear 1:

Drake 1's attacks:
Bite Attack: 24 Damage: 9
Tail Attack: 22 Damage: 5

Drake 2's attacks:
Bite Attack: 16 Damage: 5
Tail Attack: 16 Damage: 7

Drake 1 finishes off one bear, and so the other drake circles round to attack the second bear, wounding it but leaving it alive.

Rezmir makes another attack on Soar:

Attack: 14 Damage: 10 plus 7 necrotic damge.

I have that taking Soar to zero HP - is that right?

Nub is up.

(Any chance spirit guardians takes effect on Rezmir's turn and she gets damaged enough to fall?)

(Unlikely.  Will see when Jalt makes his roll...)

Con Save: 7

Spirit Guardians: 10

That's a fail on the CON save, so Spirit Guardians is lost.

Nub is up.

Nub points at Rezmir and casts toll the dead for 7 necrotic damage on a failed WIS 14 save. He then moves 4 spaces north to try to distract Rezmir from trying to end Soar permanently.

He also thinks to himself, "I really need to get those other spells added to my spellbook, because fireball and flame sphere aren't suitable for every scenario."

Rezmir's WIS save:  13

Would you like to describe how Nub's spell kills Rezmir?

The tortle reaches out with a hand, and scaled fingers make a fist. His whole arm pumps and the air between the wizard and the half-dragon blurs. "Stop hurting my friends!"

Rezmir's head abruptly knocks to the side awkwardly, and she drops her greatsword to hold onto her ears, wincing in pain. There's no bell sound, but the scenario looks like Rezmir has heard the loudest sound she's ever heard. As the sword clatters to the ground, Rezmir's hands come away bloody, and she blinks hard in disbelief at the turtle beating the dragon. She goes limp and hits the ground. Nub peers down at her and pokes her with a toe, before turning to Soar's prone form, oblivious for the moment to the drakes, the bears, and the fleeing wizard.

As Rezmir's body hits the ground, you see her black-scaled form turn to ash and lose its shape.  In only a second, all that remains is her weapon, the strange black mask, and her clothes.  All else is dust.

Jalt is up.

Jalt kneels down and places his hand on Soar. Irisv Nomeno Xiekiv Jennu Bahamut  With his bonus action casts Healing Word at lvl 2 for 6 then quickly turns around moves towards the drakes and casts Sacred Flame Dex 14 save for 6 on Drake 1

Again, Jalt you feel something going wrong with the healing magic; it seems to have no effect on Soar as something is sucking the divine energy away from her.

Drake 1 DEX save:  5

Your magical flame does hit the drake, though it doesn't do too much damage.

Bear 2 continues the attack on Drake 1:

Attack: 24 Damage: 5
Attack: 8 Damage: 12

That's a decent bite, but the claws miss.

Soar is up.  Soar, please make a death saving throw, and separately a CON save.

Soar death saving throw: 5

CON save: 13

(Retcon )

When Jalt sees that his actions have no effect on Soar, he hunkers down and places another hand on her and casts Spare the Dying. He has never seen his healing powers fail before and he is perplexed. He stays hovering over Soar acting almost as a shield.

Jalt, you feel that the magic of this spell does not fail.  Soar is no longer bleeding out, but she does not regain consciousness either. 

I will take Soar's CON save as a success.  However, Soar has no actions until she can be wakened.

Round Five:
Jos
Nate
Guard Drakes 1 and 2
Nub
Jalt
Bear 2
Soar (unconscious but stable)

You don't know what, if anything, Jos does.

Nate is up.

Nate moves 30 ft SW, like diagonally, to see if he see anything (Jos) in that larger section of the room. If he does, let me know. 

If he doesn't, he would then dash another 30 ft west, just to get a real good look in that section to make sure Jos is not there. 

Nate moves south-west, and then west, but sees no sign of Jos.

Meanwhile, the drakes have a bear to kill:

Attack: 21 Damage: 4
Attack: 17 Damage: 5

Attack: 21 Damage: 9
Attack: 18 Damage: 9

It takes them the full turn, but they finally manage to finish off the fey bear, which pops away with disappointment that its visit was so short.  The second drake then moves towards Nub, preparing to attack next turn.

Nub is up.