Man this badass sword is SO badass you wanna take your badass sword and go around killing stuff like the badass you are because it's so badass and--ahem. Excuse my French. Returning back to the topic at hand, yes, you had just crafted a new weapon from the newly unleashed ancient spirits of light and dark, using the souls of light and dark to conjure new, more powerful weapons. Sure, you had to kill a giant wall of rapidly accelerating flesh (who was also the world's guardian, so you probably made a biiiig mistake killing it) in literally Hell, but who cares? You get cool weapons. Who's the winner now, huh?
Anyhow, no better way to test your new weapon out than by MINDLESSLY THROWING IT AROUND IN THE HALLOW AND KILLING EVERYTHING THAT STEPS IN YOUR PATH! Pixies, unicorns, zombies, possessed walking hulks of armor (it was nighttime, after all), and what else would come your way.
Along your warpath of destruction across the colorful lands of purity, with the blue grass beneath your feet and the trees being topped off with colors of the rainbow, you happened across a flickering form in the air. It was some sort of butterfly, glowing a pure white. Due to its properties, it seemed to be using the moon's light to blend in, going invisible for just a few moments, before reappearing just later. This is a rare, endangered, Prismatic Lacewing..
So you kill it for the lols.
It made an unceremonious splat as your weapon easily decimates it. Such a unique and shining creature, gone in an instant.
Well...that was somewhat unsatisfying, wasn't it.
Is what you were going to leave the Hallow with before a literal aurora began to form behind you, and a twenty two foot tall fae proceeded to just kind of take form from the colors. By the looks of it (I mean, her eyes are closed, but still), she is n o t happy with your recent behavior. With four gigantic, ever changing colorful wings beating the air behind her and effortlessly raising her high above ground level, she crossed her arms, and looked down upon you.
"Oh my...you've just made quite the mistake, haven't you?" Despite her size, her voice was like a haunting echo that bounced around in your ears, a subtle but telling warning that you, my good friend, are indeed: about to die at very rapid speeds. "Such a beautiful and majestic, fragile creature, slew with not a second thought. Perhaps even a first thought, given the fact you carry a sword bigger than yourself."
"Do you know what that was? That...was a Prismatic Lacewing. I created them myself...like organic paper origami, only created from a kaleidoscope of light...a gift that blesses this land when the sun's radiant gaze falls below the horizon...and how they remind me..." The Empress trails off. Fury is thinly veiled behind her closed eyes. "...they were a tribute to a loved one..."
A pause. The Empress then turns back to you. "However, it's okay, small one. I am a...benevolent and giving monarch. I will grant you but one," the Empress raises a gloved finger, "attempt to explain your sins and misdeeds, before I proceed to tear your form apart and make it burst in light." The Empress patiently awaits your plea.