Didn't expected to become Valiant before December but thanks to
@Glassback for tips in this post I took 6* Silk to R4, ascended and awakened her and completed zone 15 in saga incursions and formed third t4a catalyst for my 7* Hyperion!
https://forums.playcontestofchampions.com/en/discussion/380581/incursions-sector-7-fun-with-silk.

My rank 3 7*s:
