blocks Ascher

The second sphere came flying at me and I countered by lifting my staff and shouting, “Defendarius!” A broad wall of force shimmered into being in front of me, and the sphere smashed against it and exploded into a cloud of flame that spread out along its length and breadth, as if seeking a way around it. The heat was viciously intense, and enough of it would have burned through the shield—but it was a question of volume. Ascher had struck at me with pinpoint precision and intensity. I’d countered her with raw power, using a shield big enough to spread the heat over a wide enough area to keep it from burning through.
Ascher let out a snarl of frustration and hurled another sphere. Her thinking was obvious—if she could keep pouring fire onto me and force me to hold up shield after shield against it, eventually she could either burn through it or exhaust my ability to keep holding it up. I’d have taken that fight against a lot of practitioners: There are relatively few wizards on the White Council who can stay with me in terms of pure magical horsepower. But while there are plenty of wizards who could wear themselves out pounding on my shields, I had a pretty solid intuition that Ascher could keep throwing fire until I was a gasping heap on the ground, especially with Lasciel’s knowledge and experience backing her up. Worse, Lasciel knew me, inside and out.
Or at least, she had known me. So it was time to use a few tricks I’d developed since we’d parted ways.
In the past, I’d worn rings designed to store a little excess kinetic energy every time I moved my arm. Then I could let loose the saved energy all in one place to pretty devastating effect when I really needed to do it. I hadn’t had the resources I needed to make new rings, but I’d carved the same spell in my new wizard’s staff.
Seventy-seven times.
It wasn’t as handy as my layered rings had been—instead of being broken up into multiple units, the energy of the spell was all stored in one reservoir, so I only had the one shot.
But it was a doozy.
So as another white-hot sphere splashed into flame against my shield, I whirled the butt end of the staff where the energy storage spells were carved toward Ascher, focused my concentration on the shield, braced my feet, and shouted, “Arietius!”


Skin Game Chapter 45, Page 377-378