The reward system is a bit strange. The goal of every temple is to rescue one of the seven sages, and the temples hide some unique equipment, but it’s not the sage that gives you the reward, instead, you often find it as part of a “sidequest”. For example the reward for Turtle Temple is the Hyrule Shield, and to get it you need to kill all the ghosts. But it seems you can get to the boss and beat it without the shield, so it’s kind of missable. And all you get from sages is “thanks!”.
You are also tasked to collect hermit crabs around the world. Those are surprisingly useful, as 10 of them allow you to upgrade one of your weapons.
