use lime/red over pure red (amps pure tho), and ditch purple mastery. First action is sell wild gem, second open red if not open, or open lime, or create a big red/lime at once, then summon monsters. And, do summon a lot on previous fields to cheese exp from there. Especially pylons, when you're about to charge the pylon fully, summon while "monsters summoned" are less than "monsters killed total", you will get a huge summon multiplier, and a lot of experience. Also, armored only mode rocks.
