Immortal builds

Hey everyone, lately I've been interested in builds that laugh in the face of things like searing exarch slam, maven's memory game blast, etc. I've been working on my CI flicker strike build to be able to do so, but there's 0 ingenuity to it, mainly just slamming expensive items.

I wonder what some of the build enthusiasts/limit testers out there have come up with :). Bonus points if it's also functional outside of being tanky!

PS: Not asking for advice on how to do certain mechanics without being tanky (aka just do the mechanic or OHKO everything), mainly interested in seeing people's ingenuity.

Most immortal builds are using Chaos Inoculation + Physical damage taken as Elemental Damage/Chaos + Transcendence + Armor stacking, which of course, is very expensive. Molten Shell / Vaal Molten Shell also helps.

Cheapest way to tank big hits is Vaal Arctic Armour (90% less damage taken for 3 hits), but it's not very reliable because of souls cost.