Reveal spell does not show it so rather not, I also tried hackmoving the dragon a bit to SW w/o a result, i.e. it still does harm to itself. Interesting thing, however, is that this happens only in that room o Destard. I was unable to spot it for example in case of Deceit or Bucc's Den dragons, this doesn't even affect other dragnos in Destard, only those appearing in that room. I can try hackmoving the monsters around to see whether it's monster or place depedant as I noticed this behaviour only in the room presented on the screenshot.
And one more thing, related to magic monsters (I posted it already I guess but I'm no sure, if so - please forgive me): they do not attack while invisible, and casting reveal makes them paralyzed.
None of this happened in the original (though, in both Exult and original invisibility makes them invulnerable).
By the way - were the monsters supposed to fight with each other in the original? I'm asking 'cause the gazer in Deceit is killing the headless everytime I approach there
![Wink ;)](./images/smilies/icon_e_wink.gif)