((Prompt: “You want weapons? We’re in a library! Books! The best weapons in the world! This room’s the greatest arsenal we could have - arm yourselves!”))
Two mares tumbled into the library, panting. The first one quickly picked herself up off the rug, dusted her wings off, and slammed the door shut while the other lit her horn, tightly latching all the windows.
“There must be hundreds of them out there!” cried the pegasus. She braced her back against the door, as though she expected something to come bursting through at any moment.
The other mare let her horn glow brighter, driving back the darkness in the library. Her lips were a grim line as she glanced at her rainbow-maned companion. “Around two hundred, if my estimates of their contagion vectors are correct.” She turned back toward the bookshelves, patrolling the library as she hunted for a book.
Rainbow peeked through a crack in the door. “Did the others make it out, Twilight?”
Twilight's attention remained on the bookshelves. “They're safe.”
“How can you be sure?” Rainbow Dash fidgeted, her wings twitching nervously. “I mean, maybe Rarity got cornered, or Fluttershy—”
“Rainbow.” Twilight used her magic to turn Dash's head towards her. “They made it out.” She released her magic and pulled a large, heavy tome off of the shelves. “I made sure of it. I teleported them all well out of town.” She used her hoof to brush the dust off the old book's cover.
Rainbow sighed her relief. “Good. Wait.” Her eyes narrowed. “If you can just teleport us out of town, then why are we here?”
“We need to find a way to stop the outbreak, Rainbow, or there won't be anywhere safe to teleport to.” Twilight opened her book, but stopped in her tracks as the door shuddered with a loud thump.
A low moan came from outside.
“Rainbow...” Twilight breathed. “Somepony is at the door. Could you please make sure that they don't get in?”
Rainbow Dash dragged a chair and braced it against the doorknob. More thumps and moans filled the library. “They're all around us!” Rainbow cried.
“Keep them out!” Twilight said, frantically flipping through the pages. “This book should say how to stop them.”
“Hurry,” said Rainbow, laying a table against one of the windows. Rotted hooves crashed through a different window on the other side.
Twilight pored over her tome. “Z... Z... Zap-toads... Zebras... Aha. Zombies.” She quickly scanned over the page. “Okay. It looks like the quickest way to disable one of them is...”
“Gimme that,” Rainbow said, yanking the heavy book off of Twilight's desk.
“Hey!”
Dash swung the book hard, clobbering the monster with the hard wood-bound cover. The zombie fell to the ground, motionless.
“...a sharp blow to the head,” Twilight said. “Rainbow, how did you—”
“Twi, haven't you even seen a zombie movie before?” She gave the book back to Twilight. “Now let's go before more get in!”