Hi ! I'm Abject :3
This mod Contains:
A 3D model of the Penetrator, the textures containing the Texture map, the Normal map, and the Specular map. The icon of the weapon.

You need DSFix to be able to change the icon.
You need DSMODT to be able to load the 3D Model and Textures to your game.

DSFix : http://www.nexusmods.com/darksouls/mods/19/?
DSMODT : http://www.rivernyxx.com/

DSFix Tutorial : https://www.reddit.com/r/DarkSoulsMods/comments/zyv4o/dark_souls_retexturing_basics/
DSMODT Tutorial : https://www.reddit.com/r/DarkSoulsMods/comments/3jxd8i/how_to_mod_dark_souls_with_dsmodt_an_introduction/

I hope you like this mod !