One of the first servitors I created, was a divination servitor. It worked quite well, he (I called him "nosy") would even do things like find lost objects for me. I would also obviously ask his help when doing Tarot readings and such.
It did however come to a point where I stopped using him, he just sort of drifted into the background. I didn't loose any more objects for a while, and my Tarot readings, well, I guess I was just trying to not rely on a servitor.
So, instead of just leaving him sort of crying in the corner not being used, to go his own way, wind down or whatever. I decided to absorb his power into myself, so I created a simple ritual where I imagined myself absorbing his energy.
The interesting thing is, I found quite to my surprise, as I had forgotten I had done the ritual, that a few months later my powers of intuition suddenly seemed to be improved greatly.
The moral of this story - don't leave a good servitor to simply fade away, or worse destroy it, that's useful magical energy....grab it.....absorb it!
See you when I have no hair....