Put 50K gold into hp and armor on TB and play with Staff of Renewal.
Bulwark of the Ages, Godplate, Groffling Warplate, Hungarling's Crown, Nimoth Chest Armor, Staff of Renewal - 39.200 gold, 7500ish hp at level 20, ~70% armor. With hp flag that is a 8600hp on top of the taking only 22,5% damage from auto-attack. And that TB will maintain >>300 dps with no problem.
IMO Hp and armor stacked TB is the best counter to damage stacking. You can push a damage build to 1K dps which will only translate to less than 250 dps after damage reduction against said TB, half of which will be negated by regen. I've seen damage stacked people go WTF when they realise they are dealing next to no damage.
The thing is though, even when you're so heavily hp and armor stacked, the rest of the world around you isn't. That 1K dps regulus could take down a citadel in seconds if allowed to get close. And his askhkandor will work on your allies too, while your bulwark aint helping anyone but yourself.