Imbecile

Imbecile is a 4th-level Black Element in. Under the target's feet, a glyph of violet symbols appears. Shortly after, several strings of light shoot up and enclose the target, weakening their magical prowess.

Etymology
Imbecile is used to discredit the intelligence of a person. An Imbecile is slightly less intelligent than an idiot, but slightly more intelligent than a moron. Since spell-casting and magical ability is often attributed to one's intelligence, weakening intelligence or one's faith in their intelligence would thus weaken magical ability.