<cough> My body won't last much longer, but Miss Voss insists I display what my powers truly are.
I can instill within you a <cough> <wheeze> magical font that will absorb void essence from slain creatures.
When the font is full, you can unleash devastating wind magic.
Go to <cough> Port Fogtide. There you will find those tainted by the Void.
Slay them, fill the font, and you will <wheeze> see my magic at work.