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A Grave Matter is a challenge set in Thousand Cuts to break nine headstones. This challenge is worth 1 Badass Rank.
Two of the headstones are lying to the left and right of the tombstone the guy is hung up on in the mission Poetic License. Six headstones are found on the ridge past the Buzzard Factory. The last one is directly to the southeast of the six. They are around the ridge, and on the right side.