Board Thread:Help!/@comment-11638159-20141010020944/@comment-5094027-20141010080138

Covered methodology in your other post, but a worthwhile grind alternative to boss fighting is Raid Mode / Goblin Invasion. Easily crafted from Goblin Scouts, each invasion should net you multiple levels per invasion with no danger, since even though the invaders are always your level, they're never particularly dangerous.