Play as Inferno.

(by the way, few "hardcore players" choose it =) why, remains a mystery to me. Maybe I just don't understand the techniques of playing with demons=)

I don't know what "hardcore players" are, but I consider this skill to be one of the priorities and try to take it as soon as possible - I even posted a replay where it clearly demonstrates its power (see details in the topic "Weak Demons", message #124).