For another item of potential interest:
You can also drop into a Sword and Board mode if you're getting beat on too hard. You'll lose a ton of DPS of course, but gain a lot of durability with an Epic Templar's Bulwark or an Epic Hard/Elite Bastion from the High Road of Shadows quests...
And the best part? It's free. Master's Touch grants free Tower Shield proficiency if you cast it while equipping the shield.
Also, if/when the Enhancement Pass goes live, a pure Dwarf Artificer can take Stalwart Defender as a racial PrE without multiclassing, unless they change what they've already said they were planning to do.
Going with a Torc of Raiyum-de, Concordant Opposition Greensteel, taking the Shield Mastery feat and using one of the aforementioned Tower Shields, taking the Construct Essence feat, wearing a Ring of the Master Artificer, Epic Cavalry Plate (for the temporary hitpoint proc), and an Axe of Famine ought to be simply disgusting. Just turtle up and roll slowly forward through the quest while all the trash dies from beating against your guard effects and Thundering Armor.