Kuropyr is a shamanic spell and a somewhat weaker black shamanic variant of Shiropyr. It's a darker, more powerful version of the more mundane Pyr spell as it kills any mortal who casts it and, despite its destructive power, can be defended against. Unlike the stronger Shiropyr variant, Kuropyr is Shadow-based and it can be cast more easily than Shiropyr. It can also be cast by any shaman, not just the rare gifted individuals or godly beings, and details of it have been written in the Book of Ofuchi. The spell is activated by uttering kuropýr.