Your results.

After two hours of study, you reach a point of dark clarity and understanding. All light dims, leaving only the runes of the page burning in your vision. You hear dark voices whisper unspeakable things to you, and feel tendrils of inky blackness crawl over every inch of your skin, and into every orifice. You would cry out in terror, and pleasure, if a black tendril were not filling your throat.

In the blink of an eye, the sensations come and pass, leaving you panting. As they drain away, they leave behind the dark knowledge in your mind. A spell, which will allow you to restore health and vigor to your body.

Spell Learned: Dark Sustenance. Once per day, you can cast this spell to restore a large portion of Health and Stamina and reduce hunger. Alternatively, you can use it in battle to purge all wounds and/or recover from being dominated.

Warning: use of the spell at high libido can have... interesting side effects.