From Archon Arcana

A player’s archives is a face down game area in front of that player’s identity card. Card abilities are the only means by which a player is permitted to add cards to their archives. During step 2 of a player’s turn,after they select an active house, the active player is permitted to pick up all cards in their archives and add those cards to their hand.

Cards in a player’s archives are considered out of play.

A player may look at their archives at any time. A player is not permitted to look at an opponent’s archives. If the ability instructing a player to archive a card does not specify where the card is archived from, the archived card comes from that player’s hand.

Official rules v1.6 July 2020