Just a minor suggestion here for the upcoming myth/magic update: a token that allows a supernatural creature to become completely invisible to all but a certain subset of creatures. What this would mean is that the AI of normal creatures would not react at all to the presence of a creature that is invisible to them. They would not be able to speak to the creature or initiate combat with it. In other words, the supernatural creature is invoking the "Invisible to Normals" trope:
http://tvtropes.org/pmwiki/pmwiki.php/Main/InvisibleToNormalsThe token could perhaps take arguments similar to the “SENSE_CREATURE_CLASS” token; except it would be: “CAN_BE_SENSED_BY:[type of creature]”. So if, for example, a creature has the token: CAN_BE_SENSED_BY:CREATURE:ELF:MALE (or something like that) then only male elves would be able to see/interact with it. It could also take other arguments like IT_REQUIRES or IT_FORBIDDEN as with interactions for greater specificity.
Examples of how such an ability might be utilised in-game include:
- a night creature that can only be seen by its chosen victim(s);
- ancestor spirits (only visible to their descendants), perhaps acting as an advisor to an adventurer;
- fairy creatures (only visible to wizards/elves/other fairy creatures/whatever) – think The Spiderwick Chronicles – which raises the possibility of normal creatures acquiring a secret/syndrome that allows them to see the invisibles.
etc.
Of course, creatures with this ability may still be detectable by their effects on their surroundings (e.g. leaving footprints in snow).