Vampirism is the art of Harvesting from a life source of sorts and fueling another source of energy, typically one’s own that is feeding from their targeted vessel.
Transmutation is a spiritual process in which establishes an energetic system that recycles specific, typically unwanted energy, for your own benefit. This energy can be utilized to your intention and desire. It can turn bad energy sent towards you into success and strength. Or those who wish ill and harm on your name turns into health and radiance. Gossip about you recycled into energy that fuels your reputation in a positive manner. 
Vampiric Transmutation allows you to lock down on a specific targeted vessel to fuel your desires and benefit you and your success.
Allow your enemies to be the reason you succeed. The reason you have so much energy. The reason you are always glowing. You can even target a specific person to feed off of. Or a general sense in which is fuel by gossip, I’ll intent, those who send hexes, etc.
The choice is yours, allow this working to be a pillar that transmutes and generates your very weights and anchors, into the very energy that benefits your mind, body, and spirit.