You can blind a foe.

With a bitter incantation, you curse your enemy, the taste of darkness lingering on your tongue. In your mind's eye, envision their eyes pierced by ethereal pins. The weave of magic responds, as though your adversary were ensnared in a web of your own conjuring.

I Cast Blindness
A creeping darkness encircles, obscuring vision—whether it's night, clouds, or an internal eclipse is unclear. A shadowy ring converges at your center. Though I'd gesture, you can't see. So, listen closely. The unseen holds my words, and imagination must illuminate what sight denies.