Low Levels are a form of currency in the online game Tibia. Some have positted that they have a form of self-awareness, but these claims are unsubstansiated and all who research the implications of this theory generally end up dead. (Most probably killed by Lunsoc, but it wasn't me who told you that).
Since Low Levels are seen as a monetary substance, they have also become a status symbol. How many Low Levels one has in their entourage (how many they "protect") is a direct indication of the size of their penis.