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Speaking to MTV, the 57-year-old said that he has accepted the role of warlord Khalar Singh.
"I have no idea how I'm going to do it," Lang stated.
He added: "I'm going to get back on a Mongolian pony and ride like the wind. I'm going to flash my scimitar. I'm going to cut the nuts off Conan and his father."
The film, directed by Marcus Nispel, stars Jason Momoa in the lead role and is based on Robert E. Howard's original Conan novels.
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