Requip

Requip (Kansou 換装) is a Holder-type magic that allows uers to store items in pocket dimensions. Mages who use this magic can change equipment (weapons, armor, clothes, etc.) during battle, which gives them a high level of flexibility in combat.

Erza Scarlet
Erz uses a special form of requip magic called “The Knight (騎士 ザ・ナイト Za Naito).”This style of Requip allowing her to change both armor and weapons at the same time, depending on what the situation is like. Her various armors and weaponry are shown to be normal and magical, as many items affect her strength, speed, defense, magical power, etc.

List of armors
 * Heaven's Wheel Armor (天輪の鎧 Tenrin no Yoroi)
 * Black Wing Armor (黒羽の鎧 Kureha no Yoroi)
 * Flame Empress Armor (炎帝の鎧 Entei no Yoroi)
 * The Giant's Armor (巨人の鎧 Kyojin no Yoroi)
 * Adamantine Armor (金剛の鎧 Kongō no Yoroi)
 * Purgatory Armor (煉獄の鎧 Rengoku no Yoroi)
 * Lightning Emperor Armor (雷帝の鎧 Raitei no Yoroi)
 * Flight Armor (飛翔の鎧 Hishou no Yoroi)
 * Robe of Yūen (悠遠の衣 Yūen no Koromo)
 * Morning Star Armor (明星の鎧 Myoujou no Yoroi)
 * Armadura Fairy (妖精の鎧 Yousei no Yoroi)

Bisca Mulan
Bisca requips using her form called "The Gunner (銃士 ザ・ガンナー Za Gannaa)," for requipping various types of magical guns. Each gun has its own kind of attack.

List of guns:
 * Dual Revolvers
 * Sniper Rifle
 * Shotgun