She/he is a really annoying boss you have to really focus with, and your not allowed to have any friends. You must solo it and defeat it while it's healing itself.
I highly recommend using 3rd person to be able to hit the orbs, when it picks you up it drains your health and puts it in orb. They will fly to it and heal it you must destroy them before they get to it because the heal a lot of it's health! When the orbs come out that's when the 3rd person comes in handy you have to attack the closet to the furthest so The orbs don't heal it. While attacking try to run in circles and remain behind it!
That's my guide for killing this boss, I have died 17 times doing it then I made a strategy (this one) and it worked so I wanted to share it with you guys! Thanks, and enjoy!