  We consider electroweak-charged dark matter in an $SO(10)$ unified theory
that solves the strong $CP$ problem via Parity. Electroweak-charged dark matter
has a colored $SO(10)$ partner, whose mass should be much above the dark matter
mass to avoid cosmological problems arising from the decay of the colored
partner. The mass hierarchy can be naturally achieved by an $SO(10)\times CP$
symmetry breaking Higgs that has a missing vacuum expectation value. The mass
hierarchy, via quantum corrections to the gauge coupling constants, lowers the
unification scale and enhances the proton decay rate. Hyper-Kamiokande will
probe the parameter space with precise gauge coupling unification. We derive
the range of the top quark mass and the strong coupling constant preferred by
radiative Parity breaking by the Higgs Parity mechanism.
