Ment
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I figured I had enough for a Spark, so I added a few side stories and did it.
The remaining 300 gems were pretty good, here's the list:
Grimnir, Lily, Summer Yael, Summer Makula, SSR Dante, double Odin, double Gandagoza, SR Galadar, double Light de la Fiy, SR Theresa, double Summer Yael, SR Summer Liliel, triple (already) Summer Jeanne.
I sparked Shiva. Hopefully, it will help me farm Grimnir.