Board Thread:Speculation House/@comment-26025032-20151124005729/@comment-27275832-20151125021333

Phantomlink959 wrote: They eat but not for sustenance, purely as a method of killing. So do they feed? and if so, on what? the windigo theory is sounding possible (though i doubt it's legit)

The grimm are sort of like viruses. They kill and reproduce simply for the sake of killing and making more creatures to kill more and make more etc. But viruses aren't considered alive, as they don't require food/energy.