Katana

Weapon

Its a katana. And it's pure white. Not silver, but a blinding white.

Its sheath is a black leather-like material, but somehow holds up to the blade, despite it being sharp and strong enough to cut through metal.

The hilt is wrapped in a blood-red scaly hide, and no one knows what creature it came from.

White

It's not quite magic, but this blade is near indestructible. Also it glows white and no one knows why.

... but it glows brighter the more danger is nearby.