You need to go to golem dungeon that opens on 10 day and go to east part. There has to be two big rocks and you have to draw number 8 by walking between them. Collete suggests you need to start from up. Keep trying till you hear a click.
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I think they obtainable as very rare drop from common stones. And also as best drop from red stones(mini game based) when you inspect specific spots that cost energy. You can find such places in the goblin forest and in bandit hideout(it's a room that just on the left from entrance inside).