The charm of the Most Ancient Blade (tonare, ravum calvaria, lucis gladius) produces an incandescent sword around the caster's wand. It can be cast so as to only stun if it hits someone.
The Blade can hit back a hex such as a Stunner (canon) like a ball.
The spell is only legal for members of Noble and Most Ancient Houses to use.
The three parts of the charm's incantation are Latin for "I thunder", "Grey Skull" and "Sword of Light" (Lightsaber).