Q: With Berserker's Noble Phantasm God Hand, you gain resistance to an attack once you're hit by it, but do you only gain this resistance by having died once? Would the same attack be effective multiple times as long as it was before he died? <Madao Gingetsu>

Nasu: You don't have to die. For example... if you were to take fire damage, once you recover you would gain +100 resistance to fire.
Takeuchi: Oh, feels like it has been toned-down. Wouldn't it have completely nullified it before?
Nasu: I said it won't work, but I don't think I've ever said it'll be negated. BB: "Mine is to nullify all attacks, Macho-san's is to triple his defense! What's the difference!?" Heracles: "It's not even close (to your hacked ability)!"
Takeuchi: No matter how you put it, it's an overpowered skill.

Fate/Stay Night Animation Material I; Q&A, pg. 42