What happens to a black hole that breaks a fundamental symmetry?

A dyonic black hole — one carrying both electric and magnetic charge — embedded in a Lorentz-violating field has its gravitational wave 'ringing' frequencies shifted primarily by the symmetry-breaking parameter, not the charges. The electric and magnetic charges reduce gravitational redshift and light-travel delays, while Lorentz violation dominates the quasinormal mode spectrum. If future gravitational wave detectors can resolve these frequency shifts, the result could constrain whether spacetime respects Lorentz symmetry near charged black holes.