Quote Originally Posted by Chronos View Post
It's not just making a 2nd level spell act like a 4th level spell. If you can do combat stuff without breaking it, Invisibility is much better than Improved Invisibility, because of the longer duration.
Sure, for PCs. Monsters are different. I haven’t ever had a creature using Greater Invisibility have it end due to expired duration, as opposed to dispel/lost concentration.