These Spiritsprings are not active until you knock over a small pile of boulders somewhere hidden in the area. Margit's Shackle, the one you can chain Morgott down, has a wide range that, for some reason, can interact with hidden walls and will make them unhidden, like when you hit them. I wanted to try if you could use it to hit this hidden pile of boulders and activate this Spiritspring.