

The sword is in a stone behind the specter. Keep going straight and youll encounter a specter that looks like a leshen or hym. Once you enter O Dimms riddle run past the bridge and when you reach a fork, turn left.
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Its not the pattern - its the sword itself. You must get to the end of the road in the time limit. However, this time it wont be a sword duel, but a riddle instead.

Master Mirrors riddle The Witcher 3 Guide If you want to get the good ending, during the final quest (Whatsoever a Man Soweth) you will have to face Gaunter ODimm - Master Mirror. Anyone found the answer to the Master Mirrors riddle
