Doryani's Elite Monster Damage Bug

"Doryani’s Elite" has an overtuned initial hit, simply broken.
The pass-through hit alone can one-shot ~4k+ life characters with armour and elemental mitigation, before the explosion occurs.
The damage is significantly higher than any boss I've faced so far and appears untelegraphed.
This feels like incorrect scaling or a damage calculation issue rather than intended difficulty.

My stats are right now:
-4.2k Life
-7.5k Armour
-155% armour applies to elemental damage from hits (11.7k) which is 77%
-I use Veil of the Night helmet so no resistance value
-I almost take no extra damage from crits 77% reduced extra damage taken from critical hits and I'm an Oracle Druid with "Lesser Harm"
-I've defend with 120% armour against projectile attacks (idk if it helps, clearly not, against this broken guy)

There is a lot to improve I know but even the bosses don't hit that hard, only this guy.