As you travel around Teyvat, you’ll notice these blue glowing creatures called Seelies. When you follow them, they’ll lead you to a base that they’ll sit in. Once you arrive, you’ll be rewarded with treasure. If you ever see one of these Seelie bases, but you can’t find the Seelie that belongs there, you can get a hint using Elemental Sight. A glowing blue stream will come from the base, pointing you in the direction of the Seelie.