alarm
Class: bard : 1 inquisitor : 1 ranger : 1 mage : 1
Syntax: cast CLASS alarm on [audible|mental]

You draw an invisible alarm rune on the ground. If the alarm detects anyone in the room besides you and your followers it will convey either a telepathic message directly into your mind, or a loud pop to nearby rooms. You can have as many alarms as you need, but after a while the magic in them will dissipate.