Shady is hiding (as with the action) in room 7.  He walks through walls.

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Wait.. how is Jaculyth carrying a gold plate? She has blindsight sure, but no arms.

(Jaculyth has a tail which she can use to hold the disk like the branch of a tree, besides she is probably wearing a leather armor too. 15×5 feet, if you want her length and width.)

 Polymorph and wild shape either causes items worn or carried to meld into the new form or drop to the ground.  Leather armor is not used in the AC calculation of the beast (ceeature type) form.  I'd say she can drag it by mouth which would impede her response to attacks or drag it with her tail, but since that's her primary means of locomotion, treat it as encumbrance (might actually be encumbrance).  Speed is reduced by 10ft.

Angus groans and rolls over in his comatose yet stable state, in the cellar.

Angus, im so sorry nobody has rescuedyou yet. thankfully, your stable.

(Weneon will still call out and stay with Angus. Ready to defend him with her life because she can't revive him)

If Jaculyth doesn't perceive the presence of a threat (Passive Perception: 15), she will revert back to her natural Tiefling form (Bonus Action). She's going to use her movement (30 feet) to enter the room 4 while being guided by the crisis call. If she finds Angus within her reach, she will administer the spell Cure Wounds on him to restore 13 HP (rolled in gamelog).

"How did this happen? Did the Shadow Horror attack Angus? The creature is neither inside the great hall nor inside the Western Foyer but I believe we can trace the footsteps outside the house to track it down."

(Edit: 30 feet movement is not enough to enter room 4, she possibly ends her turn in room 3.)

(So, did Tabaqui make it outdoors into the sunlight?  He was trying to feel his way through the darkness to the double door in room one...)

Angus awakens from his near-death experience to find the tiefling bending down over him, looking concerned.  He smiles at her as he sits up, and looking down at himself, realizes he must have been struck down, and then healed.  He thanks Marlyth for reviving him.

"I had the strangest vision," he says, "Whilst asleep I thought I heard a voice counting down numbers, and my understanding was that this world will only last a short time and then vanish into the void.  We must capture Morwena and interrogate her about this, or else find the guardians so that we may escape in time!"

I dont think blinded condition reduces movement in 5e, right? So he can be outside already. 

<I'm not so worried about the distnaces righr now, just intentions.  I'll make it known to the players that:

Morwena wants to hide from you, assuming you're not going to be helpful or kind to her at this point. 

Shady is still hunting you. 

It is thoroughly reasonable Angus would hear these thoughts and the guardians were mentioned by name in the book you found.>

Random roll 6

Anyine who made it to rhe basement sees Morwena holding the 10lb stone under her left arm, quarterstaff in the right.  She notes thst she is trapped with the lot if you blocking the stairs and holds her action. If she sees Shady, she'll cast hold monster

<She was just there the whole time, so if anyone wants to act on this possible oversight, I'll give you some space to adjust before Shady moves.  If you do something to her, she may choose to not hold her acrion and we'll change that text to reflect this.  She hasnt been invisible in a wuilez in case you missed it>

<six hours later...>

Shady appears in rhe cellar.  Morweana casts hold monster

DC15 Wis or paralyzed

Shady Wis save 16

Shady casts another batch of lashing shadows into the cellar. Everyone in 60ft of thr shadow (so in the cellar) takes 38 necrotic damage unless they pass a DC16 Dex save.

Morwena Dex save: 8

Calner is up

Some dex saves in order 

<Order again>

Shady 

Calner, 

Tabaqui,

Safeguard,

Marlyth,

Morwena,

Angus,

Weneon

Dex save: 15

Marlyth: Dexterity Saving Throw: 17

Angus' Dex save: 25

Narrowly dodging the lashing shadows, he calls to Morwena, "Wizard! We must join forces to defeat this beast and escape this island!  We wish a truce!"

Marlyth realizes that Madame Morwena has been hiding inside the cellar and probably affected by the lashing shadows because of her close proximity to the impact. Besides, the tiefling woman assumes from the words of Angus that she hasn't been fighting with the party all this time. Moreover, she doesn't believe the claim that this world is about to meet it's end.

"Angus, she possibly doesn't know how to escape from the hellish paradise unless she's one of the guardians"- she responds to the declaration of the knight, then asks Morwena, "Are you?".

Tabaqui, having exited the building, will begin searching for the guardians.  He will head to the nearest shoreline, and commence circling the island, searching for anything unusual, or any creatures that might fit the label.

Investigation: 15

Perception: 8

(Round 6)

Marlyth will dismiss the effect of the previously cast spell Darkness and cast Conjure Animals to summon eight fey creatures. They take the form of Giant Crabs and attempt to surround the Greater Shadow Horror while repeatedly snapping their claws in a menacing manner.

Giant Crabs

1st Crab  Attack: 12 Damage: 7  

2nd Crab  Attack: 15 Damage: 3 

3rd Crab  Attack: 14 Damage: 5 

4th Crab  Attack: 6 Damage: 3 

5th Crab  Attack: 21 Damage: 2  

6th Crab  Attack: 14 Damage: 7 

7th Crab  Attack: 17 Damage: 3  

8th Crab  Attack: 16 Damage: 3 

On a hit, the target will be grappled (escape DC 11)

Bonus Action: Shillelagh on Quarterstaff.