Unlike most castings, she first needed to focus on the spell. Only after that could she gather magic to fuel her will. Every drop was filtered into the spell, preventing the typical casting aura from appearing. Instead, a single ethereal thread that only she could see wove around her horn. Once it reached the tip, the thread split. Several separate threads then spread out, each finding the forehead of a pony to tether to. This allowed her rapid access to a pony's dream and to lay more potent wards to detect unwanted beings.