This is a white dwarf catalog designation. The "EGGR" prefix stands for the "Eggen-Greenstein" catalog, a list of faint, high-proper-motion stars, many of which are white dwarfs. EGGR 258 is an entry in this important historical survey.
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With a snarl, Kael charged forward, his bolter firing wildly as he fought to reclaim the temple and restore the balance of power. The battle raged on, with Kael standing alone against the forces of darkness. This is a white dwarf catalog designation