The Sisters may be found anywhere from street corners, where they offer to tell ones future for a few pennies, to those who appear to be working for the service of a lord. It is said that they go where they will, when they will they work for who they choose, not for who chooses them.
On the road up Dethl Mountain, you will encounter the guardian, Rustus, a goron Pyro Mage. only those who can take the heat will withstand him. to defeat him, one must use a goron's worst enemy: water