X-ray spectrum eRASSU J085039 (teal) shown along with NuSTAR spectra of a few other HMXBs for comparison: X Persei, a persistent BeXRB displaying low luminosity accretion in yellow (Doroshenko et al. 2012), two SgXBs 4U 1700−37 in grey (Bala et al. 2020), and 4U 1538+22 in blue (Hemphill et al. 2019), a SyXB IGR J17329−2731 in red (Bozzo et al. 2018), the persistent, albeit brighter wind-accretor GX 301−2 in light green (Islam & Paul 2014; Zalot et al. 2024), and the SFXT IGR J16418−4532 in purple (Islam et al. 2023). FPMA and FPMB spectra have been illustrated using different shades of the same colour. The strong iron line in J085039 is comparable to that of the obscured systems and one of the SyXBs. These spectra each correspond to luminosities of 10³⁵ erg s, with the exception of GX 301−2, which is brighter by a factor of ∼10.