I'm a newer player and dont have anything good to grind in dragon spider fire night or minotaur. I can't get too far into them, such as wave 20 and whatnot. only maybe wave 10 ish. im level 40 ish. also not that far. What should i spend my energy on? those big bosses or regular campaign missions? if so which ones? I already have a saurus warmaiden and shieldgaurd fully booked from farming those. Where do you suggest?