I don't know if I am doing something wrong, but I've being experiencing so much annoyance with this spell.
It happened this week against "The Warden" in the Planar Prison, and against a Lich, at the Cult of the Unseeing. So, both of them cast Contigency or Sequencer and activated Globe of Invulnerability, Protection from Weapons, and other spells that made them Invulnerable, as well as Improved Invisibility.
Ok, I tryed True Seeing or Invisibility Purge, and I could see the target. Edwin prepared Pierce Magic and/or Breach, but then the spell was lost, because the target became invisible again! What the hell? And I had just 1 Pierce Magic or Breach memorized, so I had to load the game again and again, until I could beat them (and I still don't know how I could beat them).
It's weird because when I cast Improved Invisibility in CHARNAME, after he attacks, enemies often cast offensive spells (like Maze or Finger of Death) on him. But I can't cast Cure Serious Wounds with Jaheira or Anomen on him, even after he had already attacked, because he is Invisibile to them. So, I'm having such annoyance with this spell... It seems the rules works different for the player and for the enemies...
Could anyone elucidade what I'm doing wrong, or does anybody had this same issue?