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. If an ability “puts” a card into a player's archives, abilities that trigger when a card is archived will not trigger.
“Put into your archives” is technically different from “archive” in the same way that “put into play” is technically different from “play.” If a card effect puts The Archivist into either player’s archives, it will go there face down like any other card, and its abilities will not be active.