  The Embedded Horizon is defined to be a horizon that is in equilibrium with
the exterior of the black hole, that is, isolated on the outside, but
dynamically evolving on the inside, analogous to the inner and outer event
horizons of the Reissner-Nordstrom black hole. This is shown as the result of
charge variance on the horizon, which is expressed in electrical angular
coordinates. The mass and energy of the black hole are discussed. The intrinsic
metric is calculated by taking the electric potential into consideration. An
area law evolution law is formulated, which suggests that the inner dynamical
horizon evolves until it reaches the radius of the isolated horizon. The
dynamical horizon, then, reaches equilibrium with the exterior, turning into an
isolated horizon, thus turning extremal.
