Shadow Leech

"What slipped past Tanma was a slime-covered leech about two feet long, faintly glowing with a pale, sickly light."

- Shadows in the Sky

A Shadow Leech was a mutated Kraata created by Mutran and Chirox that had the ability to suck light out of a being, similar to one of the functions of the Kanohi Avsa. For example, a Matoran whose light has been sucked out of would then become a Shadow Matoran gaining the element of Shadow and losing their original element.

Known Victims
"Who couldn’t love that?"

- Mutran's description of the Shadow Leech in The Mutran Chronicles
 * Radiak (former Av-Matoran)
 * Gavla (former Av-Matoran)
 * Kirop (former Av-Matoran)
 * Vican (former Le-Matoran)
 * Takanuva (gaining the element of Shadow)
 * Vultraz (former Ta-Matoran)

Contrary to popular belief, the former Av-Matoran Radiak was not a victim of a Shadow Leech; his light was actually sucked out by Makuta Vamprah's Kanohi Avsa.