Started Chapter 5 and I finally think I understand the battle system now. It took a while to get those elemental orbs-thing. I'm still not sure which element is opposite which but that'll come.
I'm also doing a lot of side-quests to level up my blades. I don't have so many Rare Blades yet, probably about 10 including the story related ones. I spent half an hour yesterday bonding common cores but didn't find any (I still have 50 common cores left, though). I think they should have made a better way of obtaining these blades.
New Game+ is coming: