Issues with Jamanra boss fight

first of.. i dont mind the difficulty of is attacks and mechanics but

how much health pool does he have ? did the programmer accidently pressed an extra "0" at the end ?

is auto aiming unblockable attacks timings seems off and happens way too often.
how are we supposed to place any hits when he attacks us 17x by the time we place only 2 hits ?

kinda lasts way too long you endup without potions with no way to refill

watched videos see how people manage to do it but to my great surprise, 90% of them are all witch summon raging spirits....

hes a really cool boss but feels somewhat overtunned for the place they put him when you follow the story..