This is the color used to display the mob's level number in when the mob is targeted. It is a function of the difference between your level and the mob's level. Click Here For a full table list per level Red: Mob Level >= Char Level + 5 Orange: Mob Level = Char Level + (3 or 4) Yellow: Mob Level = Char Level ± 2 Green: Mob Level <= Char Level - 3, but above Gray Level Gray: Mob Level <= Gray Level The highest mob level that gives you no experience is the Gray Level. It varies based on your character level as follows: (notes where levels have not been confirmed)