How to get star sign key?

[Swansea]

I'm now on progress making Galaxia quest "the unified key".
this quest want starsign ring.
how to get this thing.
I'm new here.
I hope anyone can help me with this.



p/s I got all 5 key.
1-keyofmoonlight
2-keyofbluestar
3-keyofflamestar
4-keyofgoldenstar
5-keyofgreenstar