people say making a spell is easy and that magic needs lots of consitration and other mistical situations say the same thing but to me i say why not combined them and make the concentration level low for example a plant life spell. A spell that woulld drain all the energy around it and store it. this is how it would go in my head:
"plant your seeds,nasuhebushe" place your wand,sword,your weapon of any kind faceing the groud. then let it disapear into the earth around you then any thing in an 15 mile radius would be covered in utterly darkness and everything in the shadows would be slowly drained of their powers and while that is going on the tree is growing and when it becomes big and sprots its leaves all the energy is gone and dies away unseen and unheard. but the energy goes to nature not the user of the spell. but if the tree were to be attacked the draining method would slow down and if it is killed the energy goes to its rightfull owner.but while you are udeing this spell your powers are sealed so that they wont b drained. how do thst sound for people who actually was reading this through.