(Bacon could be a good idea too, considering how long the battle takes)

Davis finished one undead and now was nethodically chopping another. That one proved to be a bit sturdier and though literally breaking apart, still clenched his sword and probably was able to use it. But Davis managed to keep his size and strength intact, and drowner's fate was all but sealed.

Hansel, though hit, did not let the aura of hope die. The inner light did not even flicker, keeping every hearth on the battlefield full of unflinching determination. The zombie in front of him got another burning radiant hit but was not destroyed just yet.

Spiritual hammer raised once again to hit the mermaid but the pale weapon lost its shape once it touched the scaly skin, and dissolved into nothingness.

Yusko! 

Yusko was be coming less and less precise in his strikes.  Less like a surgeon and more like a madman with the frantic stab stab punch

Attack: 26 Damage: 11

Attack: 23 Damage: 8

Bonus Action: Attack: 23 Damage: 10

The blows might not be surgically precise but they were indeed maddening, keeping attention of the mermaid on the monk. So much so, others were free to act as they were pleased.

The mermaid was obviously bleeding now but the more blood she (and Yusko) were losing, the madder she become.

Round 11

 The last attack of the tentacled creature was devastating for Nameless girl, and creature knew it, preparing to finish her victim, still stuck in the corals, off. Yusko's wound was immediately healed by the spirit, Trudie's shell protected her completely from the clumsy sword of the drowner, but Davis and Hansel did suffer a few scratches.

The heroes have not win just yet, but indeed, they were close to the victory!  (6)

Math (check out!)

Map:

 Trudie and Nameless!

Easily able to dance out of the way of her attackers, Trudie hums a tune all to herself, practically in her own little world. Like a conductor, she instructs her jelly fish to ride and bob along the current to cuddle with Sugar and Spice.

Reaction (if it has even been doing anything)
Halo of Spores
Con DC 16 or take: 6 

Action
Wildshape for 32 temp HP

On Nameless
Mmm bacon of hope: 24hp 

The healing energy from the bacon filled Nameless's mouth with a smokey, salty flavor that was most pleasing.  Feeling somewhat better, but still stuck in rock, unable to move, and being beaten on, she single single mindedly continues shooting at the mermaid. 

Attack: 23 Damage: 7

Attack: 15 Damage: 8

+6 sneak attack damage on a hit. 

Of course, Trudie's subtle spores work! They did not destroy on spot like Davis's halberd not burned like Hansel's light but they eat the dead flesh just fine.  (M2 save: 14)

But the healing was still more precious in current conditions. ((Math for Nameless corrected)) Timely too - the tentacled woman, ready to deliver the final blow, was none too pleased to see another potential undead returned to life so soon. She attacked with vicious anger:

T vs Nameless: Attack: 21 Damage: 33

Vadok - finally free and (relatively) fast-moving, darted toward the battle loudly chanting his healing prayer ((28HP to everyone, accounted for))

M1, indifferent to surrounding and changes in the battle, continued pounding on Nameless girl:

Attack: 18 Damage: 11

Attack: 23 Damage: 9

Other undead followed the routine:

M2 vs Trudie:

Attack: 23 Damage: 10

Attack: 11 Damage: 4

M4 vs Davis:

Attack: 11 Damage: 5

Attack: 15 Damage: 9

M5 vs Hansel:

Attack: 17 Damage: 9

Attack: 21 Damage: 10

On hit - DC 12 Constitution saving throw!

This was the moment when the mermaid, instead of furiously attacking Yusko, grinned again and clapped her hands together. Another invisible but no less mighty wave of heartstopping cold rashed across the battlefield, freezing the blood in every living it touched. Almost every living - some were unaffected, some could battle it.

Everyone!!! DC 18 Constitution saving throw. On a failed save, you can’t use reactions, your speed is halved, and you can’t make more than one attack on your turn. In addition, you can use either an action or a bonus action on your turn, but not both.

 Davis, Yousko, Hansel! 

Dc 12 con save : 6

Dc 18 con save : 8

Nameless one slumps in her rocky prison, unconscious. 

(Math is recalculated HP-wise (without Slow effect for the moment), so, Nameless has 17 HP still. She is just slow and afflicted)

I'll copy it here. Fresh calculations:

Trudie (75/75 + 13)  concentrating on Healing Spirit (2/5)
Nameless (17/89)  restrained,  (got Healing Spirit  from Trudie) Slow
Lair
T (tentacled) 
Vadok
B (mermaid) - wounded
Yusko (66/66)
Davis (75/75) Enlarged (last charge?), (Inspiration point)
Hansel (66/66) - concentrating on Beacon of Hope 

DC 18 CON save: 11

((Do we also have the restriction on spellcasting, where we have to roll to see if a spell goes off this round or next? Doesn't matter for this round, Hansel will just attack))

With the Holy Riding Crop of BDSM fizzling out, Hansel resorts to one-handed chastisement with the Ugly Stick...

Attack v M5: 29 Damage: 8

Davis con save: 16

Davis grimaces as he feels the magic slowing his movements. He strikes at the undead nearest him still...

To hit: 29 Damage: 8 plus 1 plus 4.

Davis save at end of turn... 25

Oh yeah! End of turn CON save: 7

(Yes, the spells are affected as well!)

Slowed or not, Davis destroyed another undead in front of him, There were two more, attacking Hansel to the left (and still moving, despite another wound) and Trudie to the right, and, of course, the mermaid herself - almost dead by all accounts, but, unfortunately, still capable to cause enough harm. The creature proved it by attacking Yusko with the rod:

Attack: 28 Damage: 7

Yusko!

(Prior to the con save that ended his turn, Davis would have moved towards the mermaid. He could only move 15 feet due to slow, but however close that gets him to the main threat.)

Trudie

Con Save 1(DC12): 6 
Concentration Save 1: 18 

Con Save 2(DC12): 21 
Concentration Save 2: 10 

Con Save 3(DC18): 12 
Concentration Save 3: 15 

Con save 5

 Yusko's frantic stabs reduced to a snails pack as be only got one stab off.

Attack: 26 Damage: 11

At this point, the mermaid looked so lost in her little victory, she ignored the slow but very precisely delivered blow, that made her whole body shudder. She screamed - audibly! - in her battle rage thrusting another claw into Yusko's body, ignoring - or relishing in blood coming from the numerous wounds:

Attack: 24 Damage: 14

Round 12

Math:

 Map

  Trudie and Nameless!

Nameless, barely aware of her surroundings after having been cut to near death, then suddenly awake again, but slow, and feeling terrible, continues her ...at this point...fully mindless actions of reloading and firing, though in slow motion at the mermaid. 

Attack: 23 Damage: 6 + 10 sneak attack damage.

Continuing their dance, Trudie attempts to bop her zombie friend with her staff. “Boop!” 

Reaction on M2
Halo of Spores
Con DC 16 or take: 11 

Action
On M2: Attack: 24 Damage: 13 + Halo of spores: 1 

On Nameless
More 🍁 bacon of hope!: 24hp