History of Power Reserve

Power Reserve is a buff granted by the Eliksni computer during the Infiltration encounter of Vesper's Host. Players can hold up to 4 Power Reserves. Destinypedia gives this cap; the other guide consulted does not mention one.

Use

Opening a BrayTech door costs 1 Power Reserve, and closing one restores 1. Reserves are also replenished by activating shield generators. The encounter requires careful door management, and some doors must be opened or closed while depositing the nuclear cores into the numbered chests in order.