Reward
Step 1 Through the tunnel west of Mortha
About 130 squares west of the Mortha temple go down the stairs at 31306,32259, walk through the short tunnel on floor 8 and come up the stairs at 31307,32274.
Step 2 Down to the crypt
Walk east to the stairs at 31342,32287 and go down to floor 8. The knight legs lie in the chest at 31359,32294 (floor 8), from level 20. The crypt is full of demon skeletons.