User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-31726296-20170527150525/@comment-4802891-20170605140011

I admit, I didn't even remember the character of Admeta! xD I'm not even sure I was aware of her existence (how far was the last time I read about Herc's labours, anyway lol?)

So, it was her... She is indeed a minor character (hence the low star rarity I guess) but she has enough to be on the Throne. There's a festival set around her myth after all.

Ah... so her third skill was a Noble Phantasm turned into a skill... and a well-known one too xD nice!