Ruined dungeon.
I teleport and end up in the very NE room.
There was no boss there, but this also means I can not open the lever for that boss.
Very sad
I think I had a similar problem with the ruined dungeon, but it was in the NW. (1.2.2)
the guardian was there, but wasn't there.
there were exactly 9 specific squares, in which he could hit me.
At first, I tried digging around thinking it was aura, but the damage, was only on the 9 specific squares.
he couldn't have been invisible, because
A) he did not follow me.
B) I could stand on ever single one, of the 9 squares.
C) I was attacked by the guardian, and not the usual "something" that shows up when I don't see it.
it was a Minotaur (or maulotaur?)
I don't remember if I tried AoE attacks.
It's a bug that happens when too many creatures try to spawn in a limited space. My AWOL addon can fix that (link in my sig). This link points you to instructions for adding it to an existing character. http://forums.te4.org/viewtopic.php?f=64&t=41596