You need to go to remiem templeand finish the race without taking any chest. Then you will get cloudy mirror. Then go to calm lands and from there go to macalania woods, go past the save point and you should come to the point where you can choose betweene four paths. One up, one down, one left and one right you choose the one that goes to the left. Then go straight again and you will end up in the trees, there will be a women with her son between the roads, talk to her and she will say that her husband is lost ore something. Then go where you came from and go to the place where there is foure paths and choose the one that goes up. There will be a couple of people talk to the man and he will say that he is lost and tell him that his wife is waiting for him a bit down the road and he will go there. Then folow him and hi will stand next to the women you where talking to a bit erlier. Talk to them and they will say that their son is missing, then go up the shining road and keep going till you see the boy, talk to him and he will say that it feels a bit strange about the place and then he will move or run down to his parents. Walk up the path that the boy left free and press X on the plant and it will ask you if you want to use the cloudy mirror then you press YES and the cloudy mirror will transfer in to celestial mirror and that's how you get the celestial mirror which you need to get the legendary weapon's.