"Come on, imagine a specific shape in your mind, a sphere, half a sphere, a cube, a triangle, whatever is simpler for you to visualise, you begin by forming the edge of it, it needs to be the strongest portion of your construct, then from there, you begin to convert all of the mana within into your own, once that is done, try to maintain it" standing a distance away, Rosemary repeated these instructions over and over again, in a room underground, crystals of mana purifying the darkness element trying to take over the natural energy floating in the air.
To provide a most suitable environment for magical training, the darkness might prove to be a good aid when training outer manipulation, but for something so complex as what Rosemary was trying to teach Helena, it was best to have a neutral environment.