Looks fine, except for the bit about being able to instantly destroy any Grimm, there are some Grimm that are more powerful than any human could possibly handle, like the giant dragon that was only frozen by Ruby's silver eye powers, or the mammoths that have lived so long they leave people alone.  As for the semblance, I was going to say it was OP, but as long as you regulate the energy consumption in a way that makes sense and balances it, then it should be fine.  No like healing wounds that would normally kill someone and being able to walk away, something like that would take your own life.  Also, if you could post the character in the characters tab, that would be great.