With high Physical Damage Reduction and Fire/Lightning Absorption, Diablo will end up healing you over time instead of damaging you. The biggest difference you'll notice is that this version of Diablo now has much higher life, much higher resistances, more powerful attacks, and Armageddon. Beware!
As of 2.4, Über Diablo is spawned by region dependant on region-wide sales of Stone of Jordan. To track your region's progress, use the
/uberdiablo chat command.When he spawns he replaces the next super unique monster that you would encounter.
Some super uniques that can easily be reached are Shenk the Overseer, Eldritch the Rectifier, Thresh Socket and Bone Ash.
But you should not spawn him instead of one of the three seal bosses in the Chaos Sanctuary, because if you do that, normal Diablo will not spawn.
Teebling Admin