Is it possible to be invincible without losing combat effectivness?

[deanisi]

Here's a build I made: https://underrail.info/build/?HgsDAwoIBwQAwqAAAAAAAABpZAAAwqDCoChzwqAAAAAAAMKgeF8IRDvDnRXDnybDoR_DnmNVYsKyccKn4p-iA-KrhgXiv4cF4r-aAt-8

At 20% (236 without armor/juggernaut) hp it will have resists:
Mechanical: 62% (15 from heavy metal, 17 from conditioning, 30 from stoicism)
Heat: 47% (17 from conditioning, 30 from stoicism)
Cold: 47% (17 from conditioning, 30 from stoicism)
Electricity: 60% (30 from tempered and 30 from stoicism)
Everything else is 30% from stoicism

With Aegis, Morphine and Nervosomnifer:
Mechanical: 187%
Heat: 172%
Cold: 172%
Electricity: 185%
Everything else is 155%

Also food can give from 5% to 35% resistance to 1 element, and Parafibrotic Regenerative Injection gives 15% to mechanical and heat.

I don't know what is max resist but I assume it's 95% like armor penalty. So at 20% (236) hp without armor you can survive up to 4720 damage with meds.
Without meds:
621 of mechanial damage
445 of cold and heat damage
590 of electrical damage
337 of every other damage

With heavy armor and juggernaut these numbers will be even higher.

[harperfan7]

Morphine and nervo don't stack; nervo is just a better version of morphine like a super health hypo is a better version of an advanced hypo. 

Mech resist from armor can go to 95%, for other damage types it goes to 100%.  Reduction is 90% for mech and 100% for everything else. 

[dddmemaybe]

No. You also cannot be completely invincible in this game (some enemy type may also skip or %bypass protection types or do hard to defend damage, like incapacitation). If you want to be more immortal, play on Easy or at least Normal mode, the game is still fun on those modes. Wait, I'm sorry I mean "Beginner and Veteran".

The best super-tank build I can think of is tank temporal distortion build going solo-TM school to spam Future Orientation -> LTI (low effective psi-cost) to get more rapid-use of Morphine and all other kinds of buffs. Such as: 8/8 spec points Last Stand feat into Stasis and into Last Stand again, ect.. Depending on enemy damage, these with morphine can create a somewhat believable infinite loop (stasis can be destroyed, so it's not as stupid as it was before). Stasis also cheeses Morphine and Adrenaline duration/cd both to sometimes chain them. The use of PSI-cost reduction stacking and Hemopsychosis means the PSI sustain doesn't brick any time quickly. The inherent power of the Magnetic filter: T.Distortion and the inherent defense-ignoring and exponential nature of T.Distortion makes the damage stay solid on only Will 9 while pumping CON to max of 16 by level 26. That build is actually trying to play the game and use their movement points and also CC the enemy though. It's not immortal or intentionally facetanking (outside of some terrain-control situations).