Qualidar said:[smartypants] The plural of Ninja is Ninja - no "s". [/smartypants]
That's an interpretation I've heard before based on the argument that "it's not the invisibility spell, so it shouldn't drop when you attack." Of course, the easy counter argument is "it's not greater invisibility, so it should drop when you attack." One interpretation makes them greatly underpowered, the other greatly overpowered. My advice would be to ask your DM which one he subscribes to.shilsen said:That's incorrect. Against most enemies, the Sudden Strike ability can be used as long as the ninja has uses of Ghost Step (invisibility) remaining. Go invisible, make an attack, and Sudden Strike kicks in. And since the Ghost Step (invisibility) lasts for 1 rd whether you attack or not, you can get full attacks and benefit from it.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.