Borg

Borg (防壁魔法 （ボルグ）, Borugu, Magic Barrier) is said to be the proof of a Magician. It is a defensive ability. It uses Magoi to cover the user's surroundings to block out attacks with evil intentions. It also blocks out most physical attacks and magical attacks to some degree. Its strength, however, depends on the person. According to Professor Myers, if the Borg is attacked by immense physical strength, then it can be crushed/destroyed.

In the case of the Magi, it seems that they are unable to dent their Borg because of its hardness unless a Metal Vessel or a Household Vessel is used. It seems that it can be distorted to change its strength in a particular region. It is also possible to create a massive Borg barrier but it requires a large amount of Magoi to maintain it.

Variations
Although Borg is a defensive ability, it can also be extended offensively. This magic has been named Borg Al-Samm, which creates dragon-like heads out of the Borg which can be used as an offensive attack. Because of this ability, the magic is also called the Eight-Headed Defensive Wall. Even in the offensive form, Borg Al-Samm is capable of defending the user from magic attacks as Gyokuen Ren was able to defend herself from Ramz Al-Salos cast by Judar in this form. Only two people were seen to be capable of doing this; Sheba and Gyokuen Ren.

Trivia

 * Ugo is the only person capable of crushing a Magi's Borg with physical strength to date. However, the Fanalis Corps of the Reim Empire have also been shown destroying Borgs with their bare hands and feet, albeit only the Borgs of ordinary Magicians.
 * Aladdin's Magic "Ugo" is also capable of destroying a Borg through physical strength.
 * Aladdin and Sheba are the only Magicians shown so far capable of distorting their Borg.
 * Magicians are the only ones capable of creating and using a Borg.
 * The name of this ability is a corruption of the Arabic word بُرج Burj, which simply means "Tower" or "Citadel".