Complaints Against Fallen Delivery Boss

Today I tried to do Fallen Delivery.
I got to the boss.
I got rekt twice.

Ok, is this fight supposed to be easy? I was an assassin and tried to fight him. He kept teleporting (nonstop) and I could barely hit him for any damage. When I did, his health regen was so severe that he was almost back to full health.

Or I'm just bad.

 

wrong section(?)

 

it's probably not a serious topic so I decided to put it here

 

Smoke bomb?
Or try multi hitting him in a corner for a long time

 

Um, I'm assassin too, so first, use vanish to evade his teleports, because you are fast and can jump high vanished, and 2, spam multi hit, spin attack (to blind him) and smoke bomb.

 

Hehe uh I've only saw the guide twice, I don't think this will help as I haven't started playing yet but...
Maybe you could get a mana steal gear, hit the boss, steal mana, vanish, rinse and repeat?
Or maybe go to the Planning something to get a team.

 

Im also an assassin and got rekt a million times. In the end I got my mage friend to help