Improved Invisibility (Illusion)
Level: Mage 4, Bard 4, Assassin 4
Mana: 40. Persistant. Base Success: 100%.
  As one might expect from the name, this is a superior version of the 2nd-level spell invisibility. It functions like that spell in all respects, except that if the invisibility effect is broken due to attacking or a similar cause, it will automatically recur in 1d4+1 rounds, at no cost in mana or time and with no chance of failure. Improved Invisibility lasts a full day, but if dispelled or cancelled by means other than attacking, it does not recur.