It's a blur to me at this point but Arc the Lad 2's final boss was at least a massive slog. First form 4000 HP, second form 9999 HP in a game where I don't think any other boss hit pass 2000 nor did you usually hit for more then 150 hp maybe 200s. All while it's AOE attacks hit for more then half your party's heath a turn while your party. You needed a lot of mana restoring items and having your players position well to get their weapon hits in if you aren't relying on just spells. (It's a tactics lite game so whips, spears, and guns had more range and hit in weird angles.)
furb posted...
More obscure one I guess for me.
I found the final boss of Lunar 2 Eternal Blue really hard. It's a long fight.
I remember this boss. My oldest sister was very into Lunar and spent over 30 minutes fighting the second phase. Up until it wiped her party and she gave up for good. I don't even think she got close to defeating him.