read the bloodstain near every boss for a small hint, go to chaos dungeon and loot a lot of rings if your arsenal is low, you cannot, read carefully the boss domains and adapt, for example the spirit that haunts after the chain bridge, he doens't really attack you, he just launch you to a high altitute and let gravity drop, much like if you walk off a ledge and fall to your death. By that point you should have a ring to counter that The chesire cat ring prevent fall damageIm around 30k of each stat and have lots of build options and yet they destroy me! :c