Weird inflection of the verb in ta form - たれた


I'm a beginner in Japanese; and as an exercise I've tried to translate a
sentence from the LN. While I do realize that I've bit more that I can chew, I
wish to at least try :)

The sentence that I am struggling with is (with emboldened specific point)

その中で **放たれた時空** の大魔法は、日本のとある高校の教室で炸裂した。

As far as I can tell, emboldened part means (roughly) 'was released in space-
time/exploded space time'. I don't really understand the たれた suffix. We have 放
in past tense, TA form used to modify 時空. I would expect this word to have った
suffix. What am I missing?




放たれた【はなたれた】 is [放つ【はなつ】](https://jisho.org/word/%E6%94%BE%E3%81%A4) in the
past passive form. (Note that
[放す【はなす】](https://jisho.org/word/%E6%94%BE%E3%81%99) is a different verb with
the same kanji.)

  * 放つ: "to unleash (something)"
  * 放った: "unleashed (something)" (past)
  * 放たれる: "is unleashed" (passive)
  * 放たれた: "was unleashed" (past passive)

It modifies not only 時空 but 時空の大魔法 as a whole. Here, 時空(の)魔法 is a category of
magic often referred to as [Time
Magic](https://finalfantasy.fandom.com/wiki/Time_Magic).

> その中で放たれた時空の大魔法は、日本のとある高校の教室で炸裂した。  
>  The great time(-space) magic unleashed in it exploded in a classroom of a
> certain high school in Japan.




放たれた【はなたれた】 is [放つ【はなつ】](https://jisho.org/word/%E6%94%BE%E3%81%A4) in the
past passive form. (Note that
[放す【はなす】](https://jisho.org/word/%E6%94%BE%E3%81%99) is a different verb with
the same kanji.)

  * 放つ: "to unleash (something)"
  * 放った: "unleashed (something)" (past)
  * 放たれる: "is unleashed" (passive)
  * 放たれた: "was unleashed" (past passive)

It modifies not only 時空 but 時空の大魔法 as a whole. Here, 時空(の)魔法 is a category of
magic often referred to as [Time
Magic](https://finalfantasy.fandom.com/wiki/Time_Magic).

> その中で放たれた時空の大魔法は、日本のとある高校の教室で炸裂した。  
>  The great time(-space) magic unleashed in it exploded in a classroom of a
> certain high school in Japan.

