You thought Diablo was the biggest unique monster in the game? (Even though Diablo isn't classified as a unique monster.) Or what about Sir Gorash? Let me tell you that it's neither one of them. When I was walking around in hell the other day with my rogue I saw this:
No matter what type of monster this was, it must have been huge enough to make Diablo piss in his pants (if he has pants ;-) I'm not sure if I should be glad or not not to have seen the monster himself.
Did you know Lazarus' room in multiplayer is full of holes? It is! I found out that there is a hole in one of the walls. You can shoot through the hole with spells like fireball and even kill some of the monsters inside by doing so. Take a look at the pic below. When I reported this at the DSF, I was told similar holes had been found long before I found this one. There is another hole on the other side of the Lair if I'm not mistaken, and also one at the back. (Someone on the DSF found these before I found the one below.)The hole I showed on this pic wasn't known back then.