The mage temporarily removes the ability of the target to process new memories.
For the Duration of the spell, the target can remember
any memories of experiences that occurred
before the spell was cast, but cannot form any new
memories. As a result, a turn after the target looks
away from something or someone, he forgets about
its presence, unless he expected an object to be in a
particular place before the spell was cast. Also, while
the target can have a perfectly normal conversation,
once the conversation ends and the target either starts
doing something else or the person he was talking to
walks out of sight, the target completely forgets the
conversation.
For the Duration to this spell, someone could greet
the target, hold a conversation with him and walk into
another room and the target would completely forget
having seen this person. A target could also laugh at
a previously unheard joke repeatedly, since each time
he heard the joke would effectively be hearing it for
the first time. Once the Duration of this spell expires,
the target’s ability to form memories returns, but any
memories lost during the spell’s Duration are gone for
good. For the Duration of this spell, the target reacts
perfectly normally and will not notice any problem
with his memory unless someone points this problem
out. Even if someone tells the target that he is having
memory problems, he will forget this information a
few minutes later. Because memory takes a short
while to process, the spell also prevents the target
from remembering anything that occurred during the
turn that before the spell was cast.
Mysterium Rote: Forgetting the Intruder's Presence
When looking through rare books or stealing ancient
artifacts, Mysterium investigators who are discovered
prefer to use this spell to keep the target from remembering
their identity and even their presence.