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Galactic X-ray sources are diverse, ranging from active M dwarfs to compactobject binaries, and everything in between. The X-ray landscape of today isrich, with point source catalogs such as those from XMM-Newton, Chandra, andSwift, each with $\gtrsim10^5$ sources and growing. Furthermore, X-rayastronomy is on the verge of being transformed through data releases from theall-sky SRG/eROSITA survey. Many X-ray sources can be associated with anoptical counterpart, which in the era of Gaia, can be determined to be Galacticor extragalactic through parallax and proper motion information. Here, Ipresent a simple diagram -- the ``X-ray Main Sequence", which distinguishesbetween compact objects and active stars based on their optical color andX-ray-to-optical flux ratio ($F_X/F_\textrm{opt}$). As a proof of concept, Ipresent optical spectroscopy of six exotic accreting WDs discovered using theX-ray Main Sequence as applied to the XMM-Newton catalog. Looking ahead tosurveys of the near future, I additionally present SDSS-V optical spectroscopyof new systems discovered using the X-ray Main Sequence as applied to theSRG/eROSITA eFEDS catalog.

From Active Stars to Black Holes: A Tool for the SRG/eROSITA X-ray Survey and New Discoveries as Proof of Concept