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There is a character (The hero) who uses a spell and this is the comment
another character does on that spell.

> …自らを表す呪文に、自らを律する韻を持たせた英雄。

My translation

> A hero who had a spell which represents him, a rhyme with which he
> disciplines himself.

Fantraslation

> A hero who used a poem about himself as his spell.

How come it's not 持った but 持たせた?  
What's the difference here?

持たせる=To have someone hold something; To allow someone to keep something
CC BY-SA 3.0
2016-02-28T11:45:56.003
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2016-02-28T16:23:58.687
2016-02-28T16:23:58.687
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question
grammar
持たせる meaning in this sentence
> 「[自]{みずか}らを[表]{あらわ}す[呪文]{じゅもん} **に** 、自らを[律]{りっ}する[韻]{いん} **を**
> [持]{も}たせた[英雄]{えいゆう}。」

As is often the case in Japanese phrases and sentences, the key words come in
**_kana_** and they are very short.

> 「A + **に** + B + **を** + [持]{も}たせる」

=

> "to let A have B"

「持たせる」 is the **_causative_** form. You cannot use 「持った」 in this phrase with
both に and を.

> "A hero who **_let_** his self-expressing spell **_have_** rhymes to
> discipline himself."

「自らを律する韻」 is, by no means, a common phrase, so more context (lots of it,
perhaps) would be needed for a better translation.

That fan-TL is a joke; you know much better than him/her.
CC BY-SA 3.0
2016-02-28T12:19:10.560
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2016-02-28T16:22:22.240
2016-02-28T16:22:22.240
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answer