Gem Magic

 Gem Magic is a unique Holder-Type Magic that is used by the former Sentinel member Noah Crest. Similar to Card Magic, Gem Magic can be used for various effects.

Description
 As the name implies, the magic incorporates the use of gems. The gems are all different shapes, colors and size, though the size is only big enough for it to fit in the palm of a hand. It is unknown where Noah gets the gems he uses, or how he makes them, but he clearly has an infinite source of them. Like Card Magic, the gems have different types of magic, ranging from elements, explosions, defenses, capturing, communication, tracking and even healing.

While the gems usually have a single color (ex: blue, red, purple etc…) some gems have shown to be a mix of several colors, an item inside of them or writing on them. Noah explains that he himself did these in order to do more powerful attacks and avoid having to use multiple gems at once for combo attacks. He’s also design his left glove to carry several gems in it while the rest he carries in a shoulder bag

Spells

 * Water Flood: As the name implies, this spell utilizes water. Using a blue color gem and throwing it towards his target, Noah releases a powerful blast of water that is capable of pushing several people back. This spell's power can be increased by using multiple blue gems at once or with a nearby body of water
 * Erupting Pillar: Using two gems, one red and one brown, or a single gem of both colors, Noah throws them towards the ground near the feet of his opponent. A few seconds later the ground explodes with a pillar of fire coming out and consuming the target. This spell can also be used as mines for traps.
 * Mirror Wall: A spell that Noah uses frequently. Using a clear glass-color gem, Noah creates a round shape shield in front of him to deflect an enemy's attacks. By combining several of these gems, Noah can increase the spell's power. He usually has these types of gems on his left glove. However if he uses it like that it takes about ten seconds for it to recharge, more depending on how much magic is used.
 * Sacred Castle: One of Noah's most powerful defense spells. He combines the power of a dark golden gem with a lightning bolt in it, a bright yellow gem and a clear gem, then drops them into the ground. Soon afterwards several bright golden towers come out of the ground around Noah, forming a circle around him while a clear, see-through barrier forms on top of it. Noah claims that whoever steps within this barrier without his permission is destroyed right on the spot. Whether this is true or not is unknown however it has been shown that it can stop very powerful spells with ease.