To shape wind into a cutting edge with vharin, one must first gather and compress the air along an imagined line, as if drawing a narrow plane through the world and pressing all within it together, through proper visualization and manipulation of their vharin. The smallest parts of the air must be driven to swifter motion, their flow constrained so that pressure and speed increase along that narrow path rather than diffusing outward. The sharper the mental image of that invisible edge, such as length, thickness, direction, and point of contact, the cleaner the cut. Most attempts fail because the caster pictures “a blade of wind” in the abstract, instead of a tightly confined current honed to a razor’s breadth.
— from the research notes of Zyr’Magi Tes’Lothen, “Magi the Blade”, high-aelv scholar, mage, and swordsman
