By Shiva.Cziella 2015-05-08 17:59:39
Prestige is earned as a player (Character, not Monipolator) under Monstrosity level cap restriction on, either from EXP from felled monsters (10% of EXP earned) or by killing Monipolators (Players as monsters, 20% of their net Infamy = Prestige earned).
The best way to go, for you would be to get infamy on your mule as a monster, and kill your mule with your main as a regular character.