

In Fate/Zero, it seems Caster was able to find Saber far too easily. I can
understand how he found her during her and Lancer's fight, as Lancer had "sent
an invitation" to all servants and Masters. Rider even noted that the other
servants were sneaking around watching the fight.

Before the attack on the Einzbern Castle, he intercepted Saber and Irisviel
while they were driving (he was waiting ahead of them on the road), and he was
able to quickly locate the Einzbern castle despite the fact that the
Einzbern's wouldn't make their base of operations so easy to find, since I
remember that in Fate/stay night, Ilya or Rin noted that the forest around the
castle messes with people's senses and makes it hard for them to escape from
it while being hunted down by Beserker.

I can understand how Medea was able to track everyone in Fate/stay night as
she set up her workshop on the leyline nexus at Ryuudou Temple and was
manipulating all of Fuyuki's leylines from that point (not to mention her
abilities make her seem like a god to modern magi, so Einzbern would be
child's play). I also assume Rin's knowledge of the castle came from the fact
that by Fate/stay night, she was the second owner of Fuyuki, and as such, she
would be aware of the Einzbern and Matou's locations, along with every other
Magus workshops legally operating in Fuyuki.

However, in Fate/Zero, Caster had neither of these things, and both him and
his Master didn't operate like proper participants in the Holy Grail War. So
how did he keep finding Saber?


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fate-zero
How did Caster find Saber?


There is probably no canon answer, but we can speculate.

> and both him and his Master didn't operate like proper participants in the
> Holy Grail War

This is actually one of the reasons why he could track Saber. Normal servant
would focus on all other masters equally. Caster on the other hand single-
mindedly focused on Saber. He could invest all of his time and energy looking
for her and following her. This is probably why Rider was able to enter his
workshop without being noticed.

As for Einzbern's bounded field. I think it was designed against humans and
low-level mages. For something like Caster, it would be child's play to break
it or to ignore it. And even if it did pose problem for him, he just needed to
see Saber entering the area. He doesn't need to know where exactly she is in
the area. That's probably why he lured her out and not approached her
directly.


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