As usual, the hardest part is the intermission. I used double tank trinkets and Necrolord.
I could also have tried doing the phase "normally", but pet took 70% health per hit, it was too chaotic.
Then entry into phase 2 is also hard. The fears are actually quite dangerous, they can chain and stun lock you, and the DoTs will kill you. I had to make sure Anduin was positioned on an add with AoE burst so one add got instantly killed. And the last add must be trapped.
Then I used interrupt and stun on the two others and killed them quickly.
Thankfully, I had enough dps to skip a second intermission, though I should have survived.