Taking advantage of the opening provided by Skipper, Kessintra strikes at the accursed vampire in fury from being grabbed and dragged about. "Die already!"

A: Shortsword to hit 22, damage 10 piercing + 9 sneak attack

Wails from the Grave on the vampire with the next lowest health for 6 necrotic

Movement and BA: If the vampire died, she will move 20 ft away from all vamps and try cunning action hide (stealth 22).

If not, she will yet again swipe at it with her dagger: to hit nat 20, damage 5

It's not dead, though it is bleeding (half health or less). However, the two vampires you damaged are no longer turned. Amelia's turn.

((Can I take back the Wails? Kessintra immediately forgot her own advice -.-;;))

I'll transfer it to the one who wasn't turned.

Amelia raises her hand, 

 "Oh, Halo of the Defender! Come to my aid! Strike down my foe with your radiant edge!"

In response, a brilliant chakram materializes near an unturned vampire, glowing with the brilliance of the sun’s halo. With a precise motion of her hand, the weapon spins forward,starts the vampire 

Spiritual Weapon

Attack: 20 Damage: 6

You create a floating, spectral weapon within range that lasts for the duration or until you cast this spell again. When you cast the spell, you can make a melee spell attack against a creature within 5 feet of the weapon. On a hit, the target takes force damage equal to 1d8 + your spellcasting ability modifier.

Which unturned one? The one grappling Kessintra or the other one? Also, that only takes your bonus action. You can still use your action on anything else.

I might not be able to post in a little bit so my turn after Amelia:

Garrick is going to repeat his attack on the one holding him.

A: (8) for a miss
BA: (19) for 8 dmg

If vamp tries to bite Garrick, he’ll use Shield as a reaction.
Striker moves over to Kess and prepares to use his reaction to impose disadvantage on all attacks against her. (or anyone else being attacked with 5ft)

The one giving Kessintra a big hug. Then Amelia shoots her longbow as part of her attack action.

Attack: 7 Damage: 5

Spiritual weapon, Longbow, and the BA crossbow attack all hit. Zan's turn.

((So will staking these guys insta-kill them? And would the attempt get advantage if they're busy grappling someone else?))

That's the thing, the stat block for both vampires and their spawn says that it only works while in their "resting place" (the crates). The effect varies between spawn and true vampires. Spawn are "destroyed". As for advantage, unfortunately not. The grappler has no debuffs (that I can remember) except having halved movement due to dragging the other person.

Zan swings at one of the ones that was just attacked, 8 to hit for 13 damage

The swing misses. Chipper's turn.

[[ Whoops! Missed this somehow. Sorry. ]]

Chipper takes aim at the one still grappling Kessintra and lets loose a bolt of flame.

Fire bolt @ Vampire grappling Kess
To-Hit: 2+6 = 8
Damage: not gonna bother

-----------

Will also do Skipper's turn here real quick.

Barring any major changes. he'll help against a vampire again.

The vampire that just can't escape Web is going to try in vain again: 19

The turned ones just run up the walls.

The one grappling Kessintra is going to both bite and unarmed strike Kessintra: Attack: 25 Damage: 8 Bite: Attack: 17 Piercing Damage: 4 Necrotic Damage: 8 

The other unturned one tries to grapple Zan: 12

Oof, first monster crit is a bite...... Kessintra, your hit point maximum is reduced by the necrotic damage until next long rest.

The unturned vampire tries again to grapple: 24

Oh wait, Striker gives disadvantage on the bite. Here's the new attack roll. If it still hits but doesn't crit..... we'll hope that doesn't happen: 13

Kessintra's life flashes before her eyes as the vampire strikes her and goes for a bite, only to be thwarted when Striker jumps into the way. At last realizing how dangerous of a situation she is in, she tries desperately to slip out of the undead's grasp.

Action: Acrobatics to escape grapple (with advantage from Skipper's help): two 11s -.-

Bonus action: dagger attack to hit nat 20, damage 7 piercing + 13 sneak attack 

Amelia's turn

Seeing Kessintra teetering on the edge of life and death, Amelia knows now is not the time to hold back. She summons another surge of radiant energy, hurling it at the vampire grappling the dark elf.

"Where are the town guards? What are those cowards doing?"

 she shouts with fury.

Guiding Bolt: Attack: 23 Damage: 13

Next attack roll made against the target before the end of your next turn has Advantage.

( advantage from Striker or Skipper )

Spiritual Weapon

Attack: 7 Damage: 10