I just killed him - very safely - in 4.03 with this setup: https://www.grimtools.com/calc/w26rqdb2
Very elated with how this build has come together. Up until yesterday I had Octavius Pauldrons in the shoulder slot - and a second Gargabol ring in the ring slot - and I was sporting a whopping 60% phys resist (3rd piece in the set gives an extra 10% res, plus flat trauma damage).
I was just idly looking upon my gear when I realized none of the Octavius pieces gives any useful + skill points to specific skills I use (aside from the Oathkeeper mastery on the helm, of course). That’s when it occurred to me to change the shoulder - I realized I’d lose 10% phys resist (which is probably overkill anyway) and could make up the trauma damage elsewhere.
I spent a bit of time in my stash looking at different shoulder options and settled on the Korvan Spaulders - base phys/trauma damage, health, aether resistance, +3 to a skill I use, and the icing on the cake: elemental to phys conversion, so I can achieve 100% (turning all fire/burn damage on RF, Guardian of Empyrion, Smite, and Empyrion devotion to armour pass phys/trauma). And I was fortunate enough to already have this particular roll in my stash - Impervious of Readiness - keeping any good looking greens throughout my gameplay really pays off!
This also meant I could drop the 2nd Gargobol Ring and take up Black Matriarch for the proc, bringing my total phys RR to -100! And I spotted a second lovely synergy - the Ugdenbog belt turns half of that poison damage into trauma to boot!
So, testing this boosted offensive capability on Ravager, it increased kill time from over 5 minutes to just over 4!
I didn’t bother putting an Arcane Spark in the medal: my combined cooldown comes to 15%, so I can run Ascension half the time, which comes with lovely energy leech resist. Between this, potions and a bit of kiting, it wasn’t a huge problem.
Yep, the Colossal Bulwark is a lovely option for perma overguard builds - drops the damage penalty to “only” 8%, and the Colossal Grasp are godly - an absolute must have for this kind of build.
P.S. I’ve left 2 augment slots in helm/belt free for chaos resistance augment (I previously had mankind vigil, but no longer need the aether). Just waiting to get revered to obtain the Solael’s augment, and that will take it to max.