In it's most basic, vanilla form, Mark marks you as Marked. How is that "very, very handy" to the demon or to the demon's master?
Like Taint, Mark should be defined to some extent when defining the rest of your setting for a sorcerer game. A specific answer depends on the specific qualities of sorcery and sorcerer subculture (if any) for a particular game.
- Marks might indicate property, romantic ties, family ties, sorcerous alliances, or whatever else.
- A sorcerer might Mark his or her coven members as a warning to any and all other sorcerers or demons to keep "hands off".
- A Mark might be totally "blank," conveying only the use of the ability, or it might be full of information, e.g. "This person is a coven member of Janice, sorceress of the Dark Lady, inscribed by her demon Vassth. No poaching."
- Tag someone with a Mark and use that later to notice them. ''(For example, if you were being assaulted at night and couldn't get a good look at your attacker, you might have your demon Mark him, and look for someone with that Mark later.)
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Ralph Mazza also suggested using Mark to making something either a "transmitter" for powers, such as Marking a person combined with Perception: Area around things I've Marked so that you can see through their eyes, wherever they go, or else "loading them" or objects with potential powers.
Some expansions on this:
- Human time bomb-
- Mark + Special damage + Perception + Ranged
- Curse upon thee-
- Mark + Taint + Boost Stamina + Perception + Ranged = whenever you are around someone who you truly love, you transform into a werewolf (and possibly attack them, if Taint drops your Humanity to 0).
