Wild Magic

Wild Magic (ワイルド・マジック, Wairudo Majikku) is the primal magic that existed in the New World long before the introduction of Rank Magic.

Background
Six hundred years ago, Wild Magic was the dominant magical art in the New World. The true masters of Wild Magic were the Dragon Lords. However, Wild Magic fell into disuse when the players from YGGDRASIL introduced the more effective and efficient power of Rank Magic. Since then, use of Wild Magic has fallen, though a few practitioners of the art still remain.

Mechanics
Wild Magic differs from typical magic in that instead of mana, it requires the caster to use souls in the casting of the spell. And although the cost of spell casting via Wild Magic is grisly, the results speak for themselves; the more people sacrificed, the stronger the magic when released. Using Wild Magic can also destroy the user's link to their own soul as well, making the casting of stronger magic a gamble.

Dragon Lords can cast Wild Magic with ease, but it seems that the intrusion of YGGDRASIL "Players" has somehow caused even their ability to use it difficult. One way to access Wild Magic is to possess the blood of a Dragon Lord. But even if a person does possess such heritage, the weaker the descendant, the greater the sacrifice of life shall be to perform the magic, with estimates upwards of millions of souls. And because of the genocidal slaughter of most of the Dragon Lords by the Eight Greed Kings 500 years prior, there are very few left who can use Wild Magic, like Draudillon Oriculus.

Users of Wild Magic

 * Platinum Dragon Lord
 * Vampiric Dragon Lord
 * Elder Coffin Dragon Lord
 * Catastrophe Dragon Lord
 * Heavenly Dragon Lord
 * Deep Darkness Dragon Lord
 * Brightness Dragon Lord
 * Draudillon Oriculus

Trivia

 * Wild Magic can also be used to forge magical items, an example would be Gazef's ring.
 * In the Web Novel, when Ainz tried to absorb the fallen soldiers exp, he ended up absorbing their souls. This way, we can say that Wild Magic consumes EXP rather than MP.