1. it depends on what you want, first boss you need leap attack, you can use the cursed sword to clear the minions + crystal
2 boss you can use the aqua claymore + a lot of aqua damage increase + lvl up the skill to clear the minions easy, after that use another weapon with haste and if possible leap attack to not waste turns to get close to him. explosives to down the legs.
3 boss im playing again the game after a long time and I didn't get to him, but if i recall well is pure rng shit, the only thing i recall is that he is gonna enter the 2 face of the combat if he gets to the end of the road, something im gonna try is to ignore him and the minions and go to the end. But yeah no plan beside that, the minions hit you hard and the boss just keep running from you and his teleport thing makes the fight more frustrating.
As for normal enemies, everything works. You can use the 1 tile hallways to fight only one enemy at the same time. Again leap attack work well for long distance enemies. Dont try to make 1 weapon for everything is gonna break soon or later have 1 or 2 with damage enough to kill enemies in 1 or 2 blows.
2.
https://f95zone.to/threads/the-shim...sed-blacksmith-v0-64b-ason.41290/post-7821092 still is RNG
3. no, you can find accesories random.