Invisibility (Illusion)
Level: Mage 2, Trickery 2, Moon 2, Bard 2, Assassin 2
Mana: 5. Long duration. Base Success: 60%.
  Renders a chosen character unseen by others. The the effect is cancelled if the character attacks. The magic creates a faint shimmering effect around the character's location that might be spotted by powerful (CR 5+) creatures when the invisible creature moves within 30 feet, or if they are alerted by the invisible creature making noise or turning invisible within their line of sight. A Spot check (DC 20) allows them to discern the invisible creature's location (as an unclear shape -- they still cannot 'see' the creature) for the remainder of the day. Even if the invisible creature drops and reactivates her invisibility magic, alerted monsters will still be able to track her via this shimmer. However, creatures only get one Spot check per day to notice the shimmer of an invisible creature.