These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Vera seru. They hurt-a-plenty (they do MORE damage with their special attack if you Spirit unlike most other enemies), are somewhat fast and they heal themselves. Not particularly hard, but they can be annoying, especially if they nail Noa with Bloodsucker while she's Spiriting. Oh, and they look somewhat like bats too.
Most bosses aren't particularly difficult if you have enough levels and remember to guard and heal as needed. The two bosses that stand out are the Berserker and Xain.
The Berserker has extremely high attack at this point in the game and uses the Rot status effect, which makes it very difficult to attack and use Arts. He can be easily beaten with the Nighto spell and a bit of luck.
Xain requires that you've learned the Orb spell (a heal spell for all allies) and that you guard when he charges up his Terio Punch. Proper battle tactics will take them both down without too much trouble.
The Woobie - All three main characters have depressing events in their backstories, but Noa, who, among other things, finds her real parents only to help cause their deaths very shortly after (they knew what they were telling her to do, she didn't), finds her brother only to discover he's the Big Bad, and loses the closest thing she's got to a parent at the very end of the game, takes the cake.
