This is the original version that is essentially a retexture of the Nightingale Sword (with some minor mesh edits.) Includes an .esp file.

This is a completely new version that is not just a crappy retexture of the nightingale sword, but a custom model. This also doesn't require an ESP; it simply replaces the meshes and textures.

This version has a much brighter polished gold color scheme, which should match the gold of Elven weapons and armor.

This version uses the original glass weapon metal textures (moonstone, I guess?) making it roughly the same color scheme as the Skyrim version of Chillrend.

I edited the proportions a bit more to get it as close as possible to the Oblivion version, and properly edited the blood maps.

This version reflects the color scheme of the sword in Oblivion as closely as possible, giving it a white-gold finish.