To get Mia's best weapon, the snow wand first you must obtain the orb of force from fuchin
temple, then go to altin. somewhere in the mine you will find a log. hit it with force and
a boulder will chase you. instead of going down the hole use retreat and go back to vale.
if you didnt go down the hole this should have triggered a secret entrance to the back of
isaacs house. move the bookcase and there is a cave entrance. There are some strong
monsters down here so you should level up first, to around level 30. Near the end is a
Giant Bat. Beat it to get the snow wand which only mia can equip. It raises attack by 161
and unleashes snowstorm.

................im guessing that that if you already went down the hole then you can get
it anymore?

I fully admit that I don't know everything, but I'm very good at this game and have not
been able to get back to Vale from that point in the game. You can't proceed past Alpine
Crossing to the west or get back through Kolima Forest to the east. So I think that some
cruel, cruel person started this rumor to get people to abandon their progress at the
hardest point in the game for a wild goose chase.

Of course, I could be wrong. If you have been successful at this, please post it here.