A Stone's Throw

Now dis ingredient you might have some fun getting, little mixah. I'm gonna give you dese stones. They're able to turn things into other things. Dose blood trolls, de ones giving de rest of us a bad name? Dey drink de weirdest things and it taints their bodies. I need their blood to finish my work here, but without de taint. Dese stones will turn dem into weaker creatures. Although, sometimes de stones turn dem into other things... Be careful with dem.