The obligatory dungeon monsters that you'd have to clear before you get to the juicy parts where you fight against the big boss. Except. We don't really know what we're fighting against right now. The villains (kingdom) don't act like villains and the antagonist (sabertooth) don't seem like a threat. There's also multiple threats going on - acnologia, zeref, time travel, the unknown disaster, the deal with Jellal and the mystery girl.