Soul gems can be used to recharge enchanted gear. Black soul gems filled with grand souls are the most effective, but also contain substances known by the State of California to cause Astral Vapors and Blood Lung.

Joke and fake loading screens and screenshots from The Elder Scrolls IV: Oblivion, run by @ChrisOfTheDead.
General links and the actual Oblivion mod made from these jokes in my Carrd page:
Soul gems can be used to recharge enchanted gear. Black soul gems filled with grand souls are the most effective, but also contain substances known by the State of California to cause Astral Vapors and Blood Lung.