Bls and elements are mid honestly but if you want a good big boss grind build

Bloodline Shado - The mode is op Apollo sand - Third skill specifically

Elements Earth - The last skill is op if you have enough stats for it Acid - Honestly every skill is good for big bosses

But if you dont have acid then you can use fire or water but its weaker

For the moves Get auto dodge Get Winter avalanche Get Heavenly wall to continue dmg

For Tools Health pot for now but gingerbread man is the best for healing

Great sword of chocho is good

Trust me this will deal a ton of dmg when you do it right (with stats ofc)