The group was back at the castle, per Tranquil's instructions.
"What are we doing here again?" Twilight asked as they began walking through the some of the door's that Twilight hadn't had a chance to check out.
"The armory, it's time the Harmony Guard returned." Tranquil said simply.
"Harmony Guard?"
"It was established by the fourth set of element bearers and consists usually of only them and me. The Harmony Guard is more just the elements and me with weapons forged by the power of the elements and armor."
About five minutes later, the group entered the primary library of the castle. Twilight had only seen the secondary library, which was twice the size of the Canterlot library, so she was shocked at the size of the primary library, which was four time the size of the secondary library. Tranquil lead the group over to the section on the Tree of Harmony.
"Yes... I know this place is huge, which is why I didn't know about the elements technically using the bearers as hosts. I may be created from the Tree of Harmony, but I still only know what I've read." Tranquil said.
"How many books are in here?" Twilight and Midnight asked in unison.
Tranquil smiled and spread out her wings, taking flight before speaking. "THIS LIBRARY HOLDS EVERY BOOK THAT HAS EVER BEEN WRITTEN IN THIS DIMENSION AND IS ONLY ACCESSIBLE TO ME AND THE BEARERS UNLESS WE ALLOW ANOTHER IN." Tranquil landed and calmed herself down. "Now then, shall we enter the armory?"
Tranquil turned around and placed a hoof on a hoof-print on the wall, the print lit up with a rainbow energy and began spreading outward, the lines connected to the former symbols of the elements (the symbols from the last time the castle was granted) and changed them to the current symbols before the symbols lit up with their respective colors. The wall slid silently into the ground bellow, reveling a large room with several sets of golden armor that had intricate designs on them, as well as a wall of weapons.
"Alright girls, everypony except our dimensional guests, stay still while I get your armor."
Tranquil's horn lit up and the first set of armor levitated over to her. The armor had the elements of magic embedded in it, it included hoof-armor and even a band for the helmet. Twilight took the armor and carefully put it on. The second Twilight's armor was on, her eyes began faintly glowing with her inner magic and her mane and tail changed their style. The element of Magic also began glowing.

Tranquil levitated a set of armor similar to Twilight's, except the element embedded in it and the 'helmet', over with a pink flower embedded on the chest. She levitated the armor set over to Fluttershy who put it on. Like with Twilight, Fluttershy's eyes gained a faint glow and her mane and tail changed in style, the flower embedded in the chest immediately changed to a butterfly and began glowing

This process, and it's subsequent effects was repeated for-
Pinkie Pie

Rarity

Apple Jack

and Rainbow Dash

in that order
Tranquil finely brought over her own armor, which was gold with a crystal-blue eight-pointed star embedded in the chest with small light blue crystals in the hoof-armor and a head band with a few light blue crystals in it. She put all her armor on, causing her eyes and the star embedded in her armor to light up with inner magic. Her mane and tail also re-styled themselves to match Twilight's.
"Now for weapons." Tranquil said, her voice now having a slight echo quality to it because of the inner magic, as she went over to the weapons wall and used her magic to remove two gold sword with six pointed stars as the hilts. She tossed the blades over to Twilight, who caught them with expertise she didn't know she had and sheathed them on her sides, bellow her wings. Under the area where the swords had been was ancient writing that translated to Swords of Magic. Next Tranquil tossed two odd curved blades to Fluttershy, who easily launched into the air and locked the braces on the blades to the base of her wings. the tip of the blades shot out as two other blades unsheathed from two different points on each blade and made what could easily be described as the skeleton (though made of metal and thinned) of bat wings. Fluttershy had heard of these types of blades and recognized the design as wing-blades (a weapon commonly used by the army). The name under where the wing-blades had been read Blades of Kindness. Tranquil then tossed a scythe of gold with a crystal designed like a vortex embedded in the point right before the actual blade. The name of it was Scythe of Laughter. Next was two daggers of gold with heart shapes as the hilts for Rarity Daggers of Generosity. Apple Jack got an ax of gold as her weapon Ax of Honesty. Finely, Rainbow Dash was given a gold sword with a rainbow-like shape as the hilt Blade of Loyalty. Tranquil formed the blade she had used earlier, it held the symbols of the elements along the hilt and had dark gold lines tracing an ancient language Blade of the Guardian.
"You got any armor or weapons to use?" Tranquil asked, looking over at Silver Night.
"Does this answer your question?" Silver asked as black armor formed on her and then two shadow swords appeared by her side, her eyes held the black mist that indicated the use of Black Magic.
"And obviously you all are ready." Tranquil said as she looked over at their dimensional guests, they all nodded and pulled out their respective weapons. "Then we're set, do you have anypony you'd like to bring to aid us?" Tranquil had shifted her gaze to Twilight's.
"I think I can get Princess Shadow Mind to come, it would be useful and would serve as a test of her loyalty, I'll also bring Princess Blood Flame since she looked like she was ready for battle. I might be able to also get Princess Red Fang to come." Twilight said, her voice also having a slight echo now.
"Then let's go." Tranquil said as she lead the group out of the armory and off to the Everfree Hive.

Author's Note

the images are made by Tzolkine, the vectors used to make the images are from JennieOo, and the original image of which JennieOo made the vectors is from Equestria-Prevails All are on DeviantART.

Other than that, the images seen in the chapter are what inspired the chapter itself, or rather, aided in my coming up of the chapter