scary monsters ~endless halloween night~ 1-12 "can't be solved with just your muscles"

Location: Mirror Chamber
Jamil: Aren’t these our parade costumes…? Though they feel different somehow…
Crewel: All because of the spell I cast.
Modifications to ensure a correct fit are faster than starting from scratch. I even touched up the finer details.
They were merely show costumes before, but now they’re perfect for extended periods of wear. I guarantee their durability.
Riddle: They’re certainly much easier to move in now than they were in that parade.
Silver: Now we can fight effectively.
Rook: These garments are so full of the warm feelings of our professors… How reassuring. Merci!
Crewel: Hmph. Making adjustments is a walk in the park for me.
… If you want to thank someone, thank the Halloween Management Committee for providing these costumes in the first place.
Rook: Vil… Everyone…
Bam!
???: HAH hah hah! Looks like you’re all good to go for the night raid!
Silver: —Who goes there?!
???: I’m the Ruler of the Forest, shrouded in mystery, fog, and darkness! … a ghost ruler, that is!
Rook: That voice… is that you, Vargas-sensei?!
Vargas: Fuhahah! Good on you for seeing through me, Hunt! I’ll have to reward you with a dozen raw eggs later.
And besides, there’s no one finer to lead the charge on our enemy than I, the great Vargas!
Alright, you beansprouts! Gather up your courage!
And follow my lead!
Trein: Ah… Hold on, Vargas-sensei!
Clang!
Vargas: Bwaugh!
W-Why… Why won’t it let me in?! My get-up meets the dress code perfectly!
Slam slam!
Floyd: Probably because your costume’s, like, more of a disguise than anything else.
Trein: Then we professors aren’t permitted to enter the mirror, as I feared.
Riddle: What do you mean?
Trein: The students of our esteemed college were the only guests listed. In other words…
Ruggie: We’re the only ones who got invited, right?
Trein: … I’m afraid so.
Vargas: Where are their manners?! How dare they reject an outstanding guy like myself!
Trein: I didn’t want you to have to fend for yourselves when we ought to be there as protection… I’m truly sorry.
Riddle: Trein-sensei, Vargas-sensei… There’s no need to worry.
We’ll demonstrate everything you’ve taught us to the fullest extent!
Crowley: Why, it truly is a pity. So sorry, everyone! Good luck in there!
Jamil: I don’t care if you fake it, but could at least try to sound disappointed?
Trey: Sorry we’re late, guys.
A pan of Trey, Ace, Ortho, and Silver’s costumes.
Ortho: Here comes the Pumpkin Knight! … is what Nii-san might’ve said.
Sebek: I’m more than ready to rescue the Young Master. Come at me anytime!
Ace: Man, I didn’t think I’d have to dress like a skeleton again…
Trey: Why not? It looks good on you.
Ace: That is a compliment, right…?
Riddle: I see you two finished changing as well.
Sam: But that’s not all, because—Sam is in the house!
Vargas: Ohh, Sam! What took you so long? I was this close to plunging into that mirror without you.
Floyd: Uh, you literally already tried it.
Jamil: And it rejected you…
Ruggie: Hey! Sam-san’s got something!
That wooden box you’re holdin’ with great care… it’s a parting gift for us, right?!
Sam: What a cunning little imp! But you won’t find any cash or food inside.
Vargas: We heard that Trappola and Shroud went around fetching people because our smartphones don’t have service.
Don’t you think it’ll be rough without a way to communicate with each other?
Rook: That’s our professors for you; you’re absolutely right.
It’d be terrible if we got separated, not even knowing where the Dark Mirror’s connection lies.
It wouldn’t be wise to go ahead without some form of wireless communication.
Vargas: Exactly! Unfortunately, this problem can’t be solved with just your muscles! Kgh!
Luckily, that’s when I recalled an ancient magic tool handed down in my hometown in the Land of Pyroxene.
Silver: Magic tool?
Vargas: This right here!
—An enchanted mirror.
Legend has it that it’ll show you anything you desire, from someone in danger, to your beloved, to even the true form of a dreadful beast.
Sam: This mirror’s a communications device based on that very legend.
Hold it up, and…
You can communicate with this mirror necklace.
Any talk’s strictly between a hand mirror and necklace. Two necklace holders can’t hold a conversation.
And while it may just be a straightforward device with pretty basic features, at least it can transmit information without radio waves!
Seems it was invented way before the spread of cell phones so people could contact their close friends.
Trein: How nostalgic. I never imagined I would see the old tool my wife and I used in our youth again.
Sam: Whatever you desire is in stock now! I can’t have people underestimating my selection.
Still, everything happened so fast. I couldn't arrange enough for everyone.
Vargas: Hence the dorm leaders and vice-leaders will take a necklace each.
We’ll support you through the hand mirrors from our side!