A schematic of the key epochs modelled in PHANES. As shown, this includes PBH seeds (stage a) linearly accreting a dark matter halo between the epoch of recombination (z ∼ 3400) and z ∼ 34; halo growth becomes non-linear below this redshift (stage b). Halos can sustain a gas mass once they exceed a baryonic over-density of 200 (stage c). At stage d, gas is allowed to be accreted onto the central black hole, and form stars. We also account for the associated feedback from both black hole accretion and star formation, and include metal enrichment from Supernovae.