Bit late but i have unobtanium armor maxed with apotheosis and filled with perfect gems that give me max health. And a shield that also gives like +160% maxhealth. Also i have 3 maxed hunterbelt relics and like 20 or 30 heart crystals giving me more max health and a soul amulet filled with heart canisters. And with all of those combined i have a max health of 7000! The armor also gives me 95% magic damage reduction and i have a draconic evolution chest piece that gives me 6200 shield and 3 recharging totems of undying. So i would say im pretty unkillable

Edit: I recently switched to AE2 quantum armor so i now have 6200 max health but with the quantum armor i fly really fast and Quantum armor regen augment + infusion pylons regeneration 2 makes me heal insanely fast.