What am I doing wrong? (Wandering Wight)

I've spent like four hours trying to beat him. The closest I've gotten was 80% health taken away but he got me with a new move which I didn't anticipate. On a good run I can immolate him with Red Tides. I can dodge 80% of his leaping and beam attacks. But most my runs fail hilariously:

  1. or some reason my Immobilize gets blocked and consumed. I can't even use it reliably
  2. ...when I do use it efficiently, I only have enough mana for three firings.
  3. I'll be in the middle of a light combo and he'll reach into the ground but I can't dodge. And once that happens I'm toast because I can't run away fast enough and dodging leaves me immobile for too long
  4. I'm Level 19. Most of the XP I gained was from farming the three henchmen right before him

And before you say 'get gud', pls keep this in mind:

  1. I don't have a week to practice enough to enjoy a game. I don't have time to watch a dozen youtube vids in order to beat each and every boss
  2. One day you'll no longer be the spry youngling you used to be
  3. Even if a game is meant to be difficult, the bosses in the first 15 mins of gameplay shouldn't make you want to chuck your controller out the window.