Flux

Flux (known as Mir in the Japanese versions) is a low-level Dark Magic tome in the Fire Emblem GBA games. It's description is "Creeping Darkness". It can be used by any Dark magic wielders. It can be easily obtained at most stores. Like all other types of Dark Magic, it is effective against Anima magic, and ineffective against Light magic. It is usually considered the most basic of dark spells. It has no special effects. It is also the only lowest level tome/weapon to have a D rank. (all iron weapons, E. Fire, E, lightning E, heal, E, flux, D)

Stats in Fire Emblem: Fūin no Tsurugi

 * Type - Dark
 * Usage: 30
 * Might: 8
 * Accuracy: 70
 * Critical: 0
 * Weight: 5
 * Weapon Rank: D
 * Range: 1-2
 * Worth: 780G

Stats in Fire Emblem: Rekka no Ken

 * Type: Dark
 * Usage: 45
 * Might: 7
 * Accuracy: 80
 * Critical: 0
 * Weight: 8
 * Weapon Rank: D
 * Range: 1-2
 * Worth: 900G
 * WEXP: 1

Stats in Fire Emblem: The Sacred Stones

 * Type: Dark
 * Usage: 45
 * Might: 7
 * Accuracy: 80
 * Critical: 0
 * Weight: 8
 * Weapon Rank: D
 * Range: 1-2
 * Worth: 900G
 * WEXP: 1

Other basic Dark Magic Tomes

 * Nosferatu
 * Luna
 * Worm

Trivia

 * This is the only basic-level weapon/spell that is not usable at rank E.
 * Mir, the spell's Japanese name, is likely a shortened version of its working name "Mistyrain".