I am now pleased to report that I have killed Ravager of Flesh on Ultimate on my Warlord (first attempt, no deaths)!
I didn’t bother trying to mess about on my Tactician or any other character. I was first going to attempt him on Elite, except the problem was that none of my characters have completed any of the expansion content in Elite - only Normal / Ultimate.
Therefore I thought I’d bring my Warlord to 100 as quickly as possible and equip him with as close to “finished” gears as possible.
With pretty much finished gears except for amulet slot and a few other tweaks, I was able to boast a ridiculous 4.1k armour (when in Righteous Fervour) and a whopping 53% phys resist (using “Immovable” Prefix on a Colossal Bulwark shield). Bear in mind I also equip an Ugdenbog Girdle and a Stonefaced Gargobol Ring of Attack, among other things, which boost armor. I also run near-permanent Overguard with 70% block chance and 100% recovery cooldown.
Therefore, given what I know about Ravager, I figured this toon was ready to face an enemy renowned for its monstrous physical hits. And he did not disappoint! It was a long battle, a battle of attrition - given that my sheet DPS is only 71k - but in the end my ultra-tankiness won the day and I was awarded with a Ravager Dreadgaze drop I don’t know how long it took - I didn’t time it - but it could have been up to 10 mins. I might time it next attempt!
I decided to choose Ravager of Flesh as like you, I decided the hp% bonus was probably most beneficial.
P.S. It does make me wonder how difficult he is on a non-shield build though!! My “Damage Blocked” stat is also 4.8k (when in Overguard) so when you add this to the armour and phys resist, these are defenses that most other builds simply cannot even come close to obtaining…