Vampiric Stones Options

i use this clear quartz crystal to store energy but i can only store so much and id doesn't last as long as i would like and leaves me tired. i was wondering if i could make the stone itself a servitor of sorts, i see it as a stone that pulls all energy around it inside it and stores it for me to use later. would this work with this stone or should i use another stone.

I'm just curious since the practice is pretty remote to me, but why are you giving your construct a physical anchor in this world? I recall hearing a saying you can't kill a living human if he doesn't have a body to kill. Does giving it a physical body-thing create constraints?