It may be indicative of hardware limitations or something else. My game quit making monsters altogether after I saw a giant clown monster at level 500 something and decided to land to kill it. A giant dragin and another giant clown came and I made quick work of them with the draginslayer sword...but then there was nothing. The game quit generating monsters altogether even when I flew back to the graveyard nothing spawned. Not sure what happened. One fella claimed to reach monsters up to level 1200 something; stating that the monsters then were so big they were unavoidable and one hit killed him.