Devour it in the same way it would do you.
From Create Your Own Story
It writhes against your embrace, but you hold it fast. The air chills as the pathetic thing struggles and it draws in huge scraping breaths: it's trying to suck your own soul out. Your eyes narrow as you feel the chill. Somehow you recognise the sensation.
"No," you comment absently, leaning towards it. "That's not how it's done."
Your smile widens as you lean in for the Kiss. You are close enough to the thing's rotten face that you can smell the decay, the stale scent of the creatures, and your nose touches it.
You can feel it's will as it struggles: it draws in huge gulps of air - it's trying to suck the very life out of you, and you feel the cold slowly seeping in. For some reason, this does naught but amuse you.
There is a pause as you watch it struggle, mercilessly gripping it, and then you draw in your own breath.
It feels tremendous: like warmth rushing into you, filling you with power, with excitement. The creature's soul tastes wretched, but it's imbued with so much ancient power that you feel the magic rushing into you.
It twitches as you take its soul, and collapses as an empty husk. The other creatures back away in terror.
You stand, eyes alight with the feeling of tremendous power rushing through you.