When I had said body horror I had been envisioning something along the lines of becoming an abomination, like a shoggoth for an example over time, however I did notice there was a great deal of that running around already so no worries.

If my character takes a core in Cold and a core in earth, are the resulting, 2/6 in dark and light enough to have minor bits of that in powers, or should one keep to things with more than that?