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In Enies Lobby Luffy used 2nd gear against Blueno and he knows that if he use
that technique for a long time it can shorten his lifespan.

Is there other character and what is their techniques/abilities that they use
that have a negative effect of shortening lifespan?


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2019-09-17T00:39:13.867
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one-piece
Is there other characters that their techniques have a negative effect of using lifespan?


A pretty extreme case would be the Ope Ope no Mi, technically speaking.

> It has the ability to give someone eternal youth in exchange for the users
> own life. Can't get any more life-shortening than that.


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2019-09-17T19:31:01.850
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According to the One Piece Fandom wiki, the [Ope Ope no
Mi](https://onepiece.fandom.com/wiki/Ope_Ope_no_Mi) and the [Chiyu Chiyu no
Mi](https://onepiece.fandom.com/wiki/Chiyu_Chiyu_no_Mi) are the two Devil
Fruits, "confirmed to shorten the user's lifespan if used in a particular
way."

Interestingly enough, the exact phrasing on the [Gomu Gomu no
Mi](https://onepiece.fandom.com/wiki/Gomu_Gomu_no_Mi/Gear_Second_Techniques)
devil fruit page says that Gear Second, "hacks away at Luffy's life force
dramatically, increasing a chance of having a much shorter lifespan because he
is starving his body." So it isn't guaranteed per se that using this technique
will shorten the user's lifespan, simply that it increases the chance that the
user will have a shortened lifespan.


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2019-09-18T08:09:54.933
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In addition to the other answers, the healing ability of Ivankov's Horm-Horm
fruit shortens the recipients life by a certain amount depending on the
severity of the injuries. Luffy traded 10 years of his life to recover from
being poisoned by Magellan in Impel down.


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