Jackman revealed last October that Wolverine will be more vulnerable than in previous incarnations.
"You think [Logan] can get out of anything because he has healing ability, and unless you lop his head off, you know he's going to come back at you," he mused in a web chat. "In this movie, how do we put it? Let's say they discover his kryptonite."
"Yes, there's a type of kryptonite metaphor," added James Mangold. "Some of the people that Logan's up against may have found ways of getting to him that are different from what we've seen before.
"We've made a very concerted effort to try and make the film more real, and pull back a little on the kind of super-duper abilities of Logan. Like, he doesn't bring down any airplanes."