Arcane Brand

Choose one creature or object. You establish a permanent link with the subject in your mind, and leave your sigil or mark upon it. At your preference, the mark may be invisible, but any creature that can cast spells can always see the mark. If the creature is hostile to the caster they may make an opposed Wisdom check against the spell save DC of the caster. If the creature succeeds any effects of the spell are negated.

You can at any time spend an action to determine the general state of the subject regardless of how far away it is, as well as direction and general distance. If placed upon a castle gate (for example), you will know the condition of the gate and the race of the last creature to have touched it. If placed upon a living creature, you know the creature's current mental state, whether it is injured, etc. You can dismiss a mark you have placed with an action regardless of distance.