Hi. Managed to get an item to a shrine to make a monster appear for a quest. The icon appeared for it someone beyond a wall. It was a "Big Red" (it became hostile after I threw a Brimstone Flask at it). Apart from appearing in a wall, it was a bit weird that it was called it's species name, not "Argullech the Harbiger of Eggs" (might be mispelt, sorry) My skill-set does not allow me to dig through the wall (though I may be able to tinker a BoMD when I find a wand) I have the Diggle god update, and am playing on Steam (1.0.9 REV B)
You can see yours! Interesting. I wonder if you can still hurt it (like Eelys on floors or Djins between walls/door) with bolts/thrown? Or does it not let you target it?