...is to cut. There is only one, maybe two people in the entire Multiverse that have the skill to cut. And it is much more than just cutting something with a sword. To Cut means division by the blade of Want, that parer of potentials that excises infinities. And by cutting, you cut not only the physical, but the universe itself. At the point where you start at, it is “merely” the ability to cut through anything not completely invincible. But by studying and growing the act of cutting, you will grow in Strength.
At the end of the road for this, you will be able to cut anything, no matter how strong or durable or esoteric or abstract it is. Not only that, but you can cut people without so much as drawing your sword, and cut things just by touching them. You can also project a “laser” from the tip of your sword, and it cuts as well as you can.