User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-28209103-20170328065900/@comment-28209369-20170328220343

I think this is likely going to be wrong, but after doing some research, could it be Eidothea? Being a sea-nymph, it would make sense for her to have the skill Alluring Nightingale. Her name translates to Knowing-Goddess, so I think she would be compatible with the intelligent Rani. She has the powers of prophecy, which could be linked to astrology, which is used to predict earthly events. She did inherit her powers and as her father was a sea-god, and she helped Menelaus when his fleet was stranded on an island, so your latest hint to sea navigation would also make sense to me. Why I'm not so sure about my guess is because I couldn't find any link to lightning with her parents, only the sea. You did mention how it was obvious that she is the daughter of a certain lightning god, after all. So my theory kinda falls flat there. Still thought I could put it out there just in case... Also, hello there, I'm a newcomer to this blog, but I've been lurking around for about two weeks now~