The mage can attune a portal (see Portal) he creates to some kind of activation trigger (such as a particular word or phrase, a given gesture or even something inherent, such as the presence of a redhead or a member of the mage’s own family), so that the portal opens and is usable by anyone who performs the trigger, but it otherwise remains closed. The mage can also use the Portal Key to declare who can (and cannot) pass through the portal.
Unlike the normal rules for spell control [1], the mage can cast this on a pre-existing portal of his own or he can combine it with the creation of a portal.
Silver Ladder Rote: Attuning the Gateway
Silver Ladder mages use this rote both as a means to program their spatial gateways and to craft instantaneous portals when a situation suddenly turns unfavorable.
