I guess a good question would be: what's a good map to auto-complete for leveling up units now that you don't have to actually sit there and do it each time (assuming no access to Immortal Beast auto-complete)? Would that be Flame Dragon (slightly higher chance of unit drop than Dragon Hunting)?

I'm going to try a couple and see what level units pop out, I know Dragon Hunting's are level 18.

Edit: It looks like Flame Dragon comes out as level 17 units.