The invincible mod commando only for ps3

Is there really a class mod that makes a commando invincible for ps3 i sure hope so i never saw one but i really want one. It highers the grit ability by 20 and you must have 5 i really want to get it if anyone is willing to help come find me on ps3, I'm Impracticalj756 come find me. I have found a commando invincible class mod only higherings grit by 8 but not 20 like the one I'm looking for. If any of you get information on where to get it like if it comes off a boss then send me a message.