Rose's Secret Armory

Rose's Secret Armory was first shown in the episode "Lion 2: The Movie". It was where Rose Quartz stored many of her weapons and equipment, and possibly where she trained.

Description
The Armory is located in a cave, on top of a tall cliff three hours from the nearest Warp Pad. The cave's floor is covered in water, and it contains a raised circular platform that seems to be activated by Steven's (or Rose's) gem. In the center of the platform lies a pedestal that Steven can activate with his hand.

When activated, the user can choose what weapons or equipment they want to appear, and they will emerge from the floor. The shown equipment includes a set of different types of swords, a set of different types of Axes (the Axes of Ages), three Laser Light Cannons (The Quartizine Trio), Spiked Chain Balls (The Heretic's Anguish), a set of different types of Armor (the Armor of the Fallen), and a giant penny.

About
In "Lion 2: The Movie," Lion brings Connie and Steven to the Armory through one of his portals. After looking through some of the equipment stored there, they accidentally unleash the Robot Shooty Thing and run away from the Armory through another portal. In "Rose's Scabbard", Pearl, hoping to find Rose's Sword, carries Steven on her back all the way to the cave, only to discover that Steven had already been there and already knew where to find the Sword. As of then, only Steven, Lion, Connie, and Pearl knew of the Armory's existence, but as of "Full Disclosure," since the Gems are seen using the "Quartizine Trio," it's possible that Pearl informed Garnet and Amethyst of its existence.

The pedestal appears to have different ways to be activated. After a brief conversation Steven and Connie had about "having to chop [his hand] off", the platform opened for the first time to reveal a set of swords. The next five times, it happened once Steven's body was poked in specific spots. Finally, the Robot Shooty Thing was released upon hearing the words "and I want to see lots of explosions."

Trivia

 * The giant penny is most likely a reference to Batman, who has a giant penny in his Batcave.
 * The design of Rose Quartz's giant penny resembles the "union shield" penny design introduced in 2010.
 * Though the first time Steven and Connie went into Rose's Armoury the penny showed up, it didn't show up  when Pearl and Steven went there.
 * The Quartizine Trio was used in "The Return" with the Laser Light Canon to fire a shot on to the Gem Warship.
 * The Heretic's Anguish bears a slight resemblance to the (likely fictional) torture device Iron Maiden. Seeing as how the spiked chain balls don't appear detachable and how the device is named after the suffering of those who hold opposite views, this is likely an intentionally darker joke meant to contrast with the show's lightheartedness.
 * Rose's pedestal shown in the armory is similar to the pedestal in "Marble Madness"