Mana-Sucker

Mosquito Magic: Mana-Sucker (モスキート魔法『サックザーマナ』) is a Mosquito Magic spell.

Description
With an open grimoire, the user extends large metallic needles from their palms. These needles drain the mana from anyone they scratch or pierce.

Because the mana is stored in the needle itself, the user risks the needle being turned on them and draining their mana.