Compared to the Black Swamp, the strange creaurtes in the Mystery Valley were actually quite pitiful. There was a Scott family guarding outside the valley.
Low-level strange creatures could not get out.
Every time one of the strange creatures advanced to A+ rank, the Salko Temple would appear and take away the A+ rank strange creature.
The Black Swamp was different. The strange creatures were all inside the swamp, so it was impossible to catch them.
The Black Swamp was also larger than the Mystery Valley. It was at least three to four times the size of the Mystery Valley.
There were more than 100,000 strange creatures below D rank in the Mystery Valley. However, in the Black Swamp, one simply could not count how many low-level strange creatures there were.
The Mystery Valley had four A rank strange creatures, and they usually did not leave the valley.
