So, I've been stuck on the Doppelganger, but not just the Doppelganger, Tagar and Hasidim were also really unfair bosses. From what I hear, these bosses got a beef up a while back (I've been off the game for a few years until recently when I came back and tried to play the stories I missed to catch up). What I found in G21 was a PURE EVIL difficulty spike that I only have one thing to say: Whoever designed the boss fights for this generation needs to be fired. Or demoted to janitor. I'd settle for either or. G20 was pretty fair, even if I didn't like the "Survive for this amount of time" and then you can do damage/kill the boss. It wasn't the funnest storyline battles, but at least G20 was fair in it's difficulty. G21 though, I don't know if you guys decided that you made it almost impossible to discourage players from trying to get Nascent Divinity, or you just like bullying your players, but this is unacceptable game design.
And before anyone tries to say "It's fair, get good you idiot". I am level 11,000 cumulative with a mastery in magic, physical combat, lance combat, puppetry, and working towards a gunner master and chain slash master title. I've been playing this game since G9 (with exception of the few years I took off from the game because it got boring). I know this game pretty darn well, and I can easily make my way through most hard and elite missions with ease. But G21 ramps up the difficulty to a brand new level simply through poor design.
First is Hasidim. I don't know what is up with this guy, but he can go through obstacles like they're not even there, so you can't hide from him if you need to take a moment to breathe, and his dash attack can hit you 2 or 3 times in a row to kill you (His attacks do like 500 damage each). This boss isn't the worst, but he really needs better balancing. The boss being able to come after you from anywhere on the map is just unfair while you're trying to collect yourself.
Then there's Tagar... Oh my god... I went through so many Nao Stones before I finally beat this reaper woman. The BIGGEST culprit was her teleport attack where she goes into the ground and comes up underneath you. The problem with this attack is that it's random on whether she comes up behind you, beside you or even in front of you. She's supposed to attack a certain area and if you move you can avoid it, but the area she is to appear in isn't consistent. I only beat this boss because of the Nao Stones and MANY MANY health potions. Her attacks weren't hard to predict, but the teleport move just gets REALLY unfair and does at 600-800 damage (sometimes even critting for an instant kill). It's impossible to predict which way to run because she pops up randomly around other sides of you and you have no way to know before she's basically already hit you. Some of her other attacks also don't have clear patterns, like one that slows you down, and the fog that causes it just "appears" under you. There's no pattern, no running away from it, it just appears wherever you are. I thought it had to do with the area in front of her so I got behind her, and it still appears where you are. And in a fight where you need to move or you're gonna die, slowing down the player just to make sure the boss's next teleport hits is completely unfair. The only attack she has that is fair is her classic scythe swing that fires a slash wave in one direction, but even that can clip you when you're far away from it because the attack has a much bigger hitbox than the attack physically looks.