Sorry, I have a question. I would like to invest some points on MEN for an app. How much points is recommended? I love critical hit skills and, apparently, can increase cast spd. I don't know if there's a "guide" for MEN stat, i think is the most interesting stat since it can affect many attributes.
MEN works in points of 6. I personally was around 32 MEN as a 76 Mage in the CBT, but I think you might as well get 42 MEN by the time you reach end-game. It increases Hit Rate, Skill Critical, Dodge, and Skill Speed (hidden stat which lowers the global skill cooldown) -- most relevant of which are Skill Speed and Skill Critical to a Mage (as you don't really need Dodge optimally and Hit Rate seems to be bugged.)
You wanna grab MEN in points of 6, but since your Magic Poison functions off your Magic, it's always great to have INT.
STA is good to have for bosses and potential suicide AoEs, but since your question is about MEN I wlil just say that it honestly comes down to preference, I think crits become more noticeable around 32 if that answers your question and Magic Fire II procs two fires which both have a chance to crit (split damage from I).