Luminosity redshift plane for X-ray fields in the 2−10 keV energy band. The black points show the XXL-1000-AGN sample. The orange shaded area shows the parameter space covered by the full XXL catalogue. The yellow shaded area shows the expectation for the four-year all-sky coverage by eRosita. The XXL survey is a stepping stone between current deep surveys (coloured points) and future all-sky surveys.