I call Awakened cards the G-series because of their rarity. GSR/GUR. To max these cards are a little tricky. From this point on i would use metal slimes to max them out.
GSR: 1 lv40 metal slime+arcana training & blessing
GUR: 3 lv40 metal slimes+arcana training and blessing (add another if not enough.)
These are the methods i would use to max out the G-series, but you can consult the wikia if you want more information.
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Basic Guide: Valkyrie Crusade (Revised)
RandomSelf Explanatory. simple guidebook on some things in the mobile app game Valkyrie Crusade. Originally owned by Nubee Tokyo and was sold to MyNet Inc as of 2016. Do take note that these are the methods on how i do things in game. there could be other...