Some of my builds can kill Mogdrogen.
But it was only yesterday that I killed Ravager for the 1st time. (Bleeding Tank).
To me he´s classes above the Avatar.
Yet the “biggest monster killed” remained “Avatar of Mogdrogen” on my hero.
What does the game define as biggest monster? Hit Points?
An interesting question. Also, Avatar of Mogdrogen is “bigger” than Callagadra. Maybe it is because he is a god and the rest are smaller deities, from lore point of view? Or they are equal in strength and Avatar is first on the list alphabetically? Amount of hit points is the same, so cannot tell for sure.