Doomcaller's Trousers

You seek to prove your worth to my kind, mortal? Very well, perhaps we can be of mutual assistance. The ancient sandworm, Ouro, is a being of legendary power. He is rumored to have been created by the Old God himself as a mockery of life. His skin is unnatural... thick, nearly impregnable, yet it's flexible and allows him to move with the speed and grace of a much smaller creature. Bring me a sample of his skin along with other minor components and I shall craft you leggings of great power.