The Obsidian Blade is an experimental wrench created by Vox Industries and modeled off of Gadgetron's Omniwrench 12000. Its core was composed of 'vorpal matter' taken from an H class black hole. This wrench could be bought from any Vox Industries weapon vendor for 40,000 bolts.

This was the final wrench Ratchet used while competing in Dreadzone, but in Challenge Mode it could be upgraded to the Obsidian Blade V2.