You know brother, you should pick a wife from the village down the river. I have an idea for a test
Since you can turn invisible, we can ask each maiden what your bow is made of! You can marry the maiden who tells correctly what your weapon is made of!
We are going to marry the invisible hunter!
Sister birch, please give me your skin to make me a dress for my husband to-be!
Here comes my brother, what is his bow made of?
His bow is made of the road of the ancestors, the milky way. His string is made of the rainbow!