Soft band luminosity distribution of the groups and clusters in the lightcone in function of their redshift. The errors are the 16^th and 84^th percentile from the MCMC process to extract the luminosity. The data points are colour-coded for their extent likelihood. The shading areas represent the range of survey flux limits given by the completeness from 10% to 90% in steps of 10% difference with decreasing colour. The red curves represent the flux limit in eFEDS (1.5 × 10⁻¹⁴ erg s⁻¹ cm⁻²; Liu et al. 2022c) and eRASS1 (10⁻¹³ erg s⁻¹ cm⁻²; Seppi et al. 2022) for 40 and 30% completeness respectively.