Do you have the Devotion ability?
You might be able to save yourself some of the later hits as his enrage builts by:
Wait for Devotion to be off cooldown
Debiliate
Wait for Debilitate to end
Warp Time
Devotion
Warp Time restores adren/devotion
Devotion again
You got this champ! I want to see a post from when you get your first kill!