If the character was invisible without being able to see invisible, his location on the map showed any object there or underlying topology instead of the hero even when monsters could be seen with infravision, ESP, or sustained monster detection. The ESP case required an amulet or helm or quest artifact to be noticeable because being blind overrides being unable to see invisible, so the more common form of telepathy didn't exhibit this behavior.
14 KiB
14 KiB