User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-30314236-20170525200823/@comment-30314236-20170527183545

Thank you for your kind words :D

Well, it's because that she has a slight connection with human stories that she was able to tweak the system and be able to be summoned (that's my interpretation, though).

Just to say, if Deneb were to cease to exist (turning into a supernova), since it is her death, some skills like her Distant Existence would dissapear, and her Independent Action would drop to A+.

I wish we could summon stars with relevance in our stories, though... (DW, prepare those 3 for Tanabata please T.T)