Neville paused at the door to a room two floors below the surface. It was near the Resonator Stone at the very center of the palace. It was here that the ley lines converged, where the wards at the boundary of the grounds drew and renewed their energy from. It was also the place where Harry could tap into the natural energy of magic, that criss-crossed Great Britain like a giant, super-charged spider's web, and put it to whatever use he chose for it.