Mail from Jina

I've been doing a lot of digging on the Flow battery you found. Humans used to use these to power all sorts of things... You know, there's this old door under the waterfall that I've been trying to open. It's just a little ways past the shrine we first met at. I've tried all sorts of things to get it open. Maybe this battery could be the key... Why don't you give it a try? This place used to belong to your people after all. You really should be the first one to check it out.