User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-31726296-20170609230836/@comment-31726296-20170610145932

if you want fiction, it was introduced around 2004 just like fate/stay night, anime I think. I Believe they even had a crossover once. However, Rider was introduced about 2009-ish in the manga sequel. also was referenced in their third season in 2007.

The Protection from Arrows skill is a sixth-sense kind of deal instead of being a charm.

For EAM she was claims by a relative of riders friend that she was one of the most powerful knights in history. none sure about the gun, however I believe she use a sword in her flashback. I need to read more of the manga to confirm that.

The rules of their magic,??? Magic System, etc, would make  sense if it came from a different planet. meaning Gaia has no influence on it and it's capabilities. which means it is from a different fiction then Type-Moon's. I really don't like I am trying to explaining that, but oh well.