Halo series. Forerunner saga

Bornstellar Makes Eternal Lasting is a young rebellious Forerunner who seeks out the marvelous artifacts left behind by the Precursors --long-vanished superbeings of unknowable power and intent -- an act that forces his father's hand and forever changes Bornstellar's destiny ... and the fate of the entire galaxy.

"In the last years of the Forerunner empire, chaos rules. The Flood--a horrifying shape-changing parasite--has arrived in force, aided by unexpected allies. Internal strife within the ecumene has desperately weakened Forerunner defenses. Too little, too late, the legal rate of Juridicals is only now investigating possible crimes by the Master Builder and others. Evidence-gathering agents known collectively as Catalog have been dispatched to collect...