Starfinder: Necrovite

Long ago, when the native humanoids of Eox—called elebrians—destroyed two
neighboring planets, the backlash devastated their own world as well, forcing
them to turn to necromancy to survive. The most powerful spellcasters among
these survivors combined their advanced technology with the ancient magical
traditions of lichdom to achieve immortality in the form of eternal
undeath.

    These were the first necrovites, and along with their
colleagues who sought refuge in other forms of undeath, they took control of
their ravaged planet to become the first bone sages, Eox’s notoriously aloof
heads of state.