Do not underestimate a quality build with this weapon. With use of blood bullets and the rally system, the light waves are nearly infinite which even at base arcane racks up damage depending on how much you charge it, not to mention the hit stun. If you are unfortunate enough to face such a build, be even more on guard when the sword isn't transformed, as the viscerals will sustain usage of light waves if they don't take out all your hp. Now just imagine a build that has access to all physical damage types that can use any, cannon, the minigun, flamesprayer, rosmarinus, and a tonritus for good measure. Yes, you could max out the potential of the sword, but I think versatility always wins.