Slimes are numerous and a low level monster that causes no issues. But one was born as a mutation. This slime was able to change properties based on and depending on what it was able to absorb. As time went on it was able to avoid people and gain more strength as time went on. Before long it was able to absorb small monsters and even getting to the point where it could absorb people. This allowed it to blend in with people when it wanted to and defend itself. But in the natural form and the form most people say it as, was still a small slime. When it would be attacked now or just for fun it would mess with people either changing into something it had absorbed, a plant with tentacles, a squid, a animal or insect, or eldritch beast, among others.
