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In Fate/Zero, Rin is given a Mana Compass by her father which she uses in her
search for Kotone. I've only seen up to episode 10 but I know she'll appear in
a later episode where she will receive the Jewel Pendant which becomes the
catalyst to summon Archer in the 5th war and saves Shirou's life.

However I don't remember her Mana Compass being mentioned in Fate/Stay Night,
nor can i foresee a situation in Fate/Zero where it would be destroyed. Given
how it works it seems to be quite a useful tool Rin could've employed in the
5th war.

So I am wondering, is it stated what happens to the compass, since it seems
Rin treasures the Jewel Pendant she was given, since it came from her father,
and I would assume she would treasure the compass as well.


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fate-zero
What happened to Rin's Mana Compass?


To the best of my knowledge, it's never mentioned again (not even later in
Fate/Zero), aside from a throwaway reference on [the Fake/states night
webpage](http://www2.tba.t-com.ne.jp/taoru/resistance/fake/system.htm), which
describes it (魔力針) as an item you could find in-game and which has Rin's name
engraved on the back of it.

From an out-of-universe perspective, the obvious reason why we don't know what
happened to it is that it was invented by Urobuchi for Fate/Zero, which was
written after Fate/stay night, and it's not so important an object that its
whereabouts in Fate/stay night would need to be explained.

From an in-universe perspective, I think the best explanation is that by the
time of the Fifth War, Rin no longer needed the device - skilled mages can
already sense magic to some extent. During the Fourth War, though, when she
was just 5 or 6, she probably wasn't experienced enough to be able to detect
mana all that effectively, and so the compass was somewhat useful to her back
then.

By the way,

> Rin doesn't get the pendant during Fate/Zero. It's only at the beginning of
> F/SN (the day before she summons Archer) that she finds it with her father's
> effects. Rin does happen to show up at the end of Fate/Zero (for Tokiomi's
> funeral); that's when she receives the Azoth sword from Kirei.


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Shirou could feel the presence of Medusa/Rider in the 5th Episode of Unlimited
Blade Works.

I would say, if a third rate novice Magus could feel the presence of a
Servant, a Genius like Rin wouldn't need her Mana-Compass anymore during the
5th Grail War.

Also, if I remember correctly. Command Seals vaguely "ping" Servants or strong
Mysteries? Rin's Seals react in the Fuyuki Park in Episode 0 of UBW and she
later feels the presence of Riders Blood Fort Andromeda, also during Episode
0.


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