Hey so sympathy is like, changing forms of energy into other forms of energy right?
But… matter is energy. If you hold a ball and raise it in the air, it gains a tiny amount of mass because you are giving it gravitational potential energy.
Anyways you could probably do some fission (making one element into two different smaller ones) shit with sympathy. Probably not fusion because that requires the energy of the actual sun but the point remains that with some artificing you could probably make like, a nuclear reactor/atom bomb. (Although carving a ruin into a uranium pellet would be… hard.)
Or you could just change matter itself (with a massive source)
Also there is a small possibility I’m thinking too far into this.