The Can't Feel a Thing challenge in Caustic Caverns requires you to stand in the acid pools for 30 seconds without entering Fight for your Life mode. When I first got a shield immune to Corrosion damage I thought I cracked the secret. Surprisingly, corrosive-immune shields don't actually protect you from the acid. And at level 38 the acid is still quite painful even in Playthrough 1.
How do I get this challenge? Do I need max level and a crazy shield or is there some trick to it? FWIW I'm a Siren and could conceivably boost up a Turtle Shield with skills and a Class Mod but ideally I'd like to know a way all characters can do this.
Best Answer
I looked into this a little bit (youtube) and it appears that your understanding of the challenge is incorrect: you need to "not go into Last Stand Mode" rather than "not break Shield."
So you need a high level shield and a high high health value. I play as Salvador, and in my case, especially with some skills upgrade, when I activate the Gunzerker skill, my health bar recovers faster than I take damage.
So if you have a health regen skill, activate it right when the shield goes down, and this may delay your death.
( see: http: // www.youtube.com/ watch?v= ZOHBabyZmr8 @ 1:20 )