History of Atheon's Memory

Overview

Atheon's Memory is a PvE armor set tied to the Vault of Glass raid and the Atheon encounter. Its theme is Orbs of Power: the 2-piece bonus rewards grabbing one, and the 4-piece bonus makes your subclass buffs generate more. Sources checked do not state the season it arrived in. One guide describes it as a Monument of Triumph armor reward, reworked from older raid gear.

Set bonuses

• 2 pieces, Radiolaria Breach: after you pick up an Orb of Power, the next time your shields break you gain a temporary Health boost and release a burst of radiolaria. It suits builds that keep Orbs flowing.
• 4 pieces, Collective Power: while a subclass buff is active, sustained damage creates Orbs of Power. This is the stronger bonus for players who stay in a buffed state through a fight.

Acquisition

Drops from the Vault of Glass raid. Check the in-game collections or a current guide for the current drop rotation.

Notes

Sources checked (Blueberries.gg, a search snippet from Dot Esports) agree on the bonus text. Check Bungie patch notes for later changes.