Oda's One Piece is absolutely spectacular, and, over the years, fans have seen him craft some of the most intriguing fighting styles and power-ups to excite the fans.
One Piece: 8 Devil Fruits That Can Kill In One-Shot
These powerful One Piece devul fruits can kill in one shot.
While some power-ups are quite straightforward, others actually have a big asking price. Fans have seen quite a lot of One Piece power-ups that end up having adverse effects on the user themselves. These power-ups are rare, however, the trade-off made for them can be worth it sometimes.
9 Gear Second
Burned Luffy's Life Force Before The Timeskip
Gear Second is one of the very best power-ups invented by Luffy, and it is still one of the very best abilities that he has up his sleeve right now. Luffy invented Gear Second by making use of his rubber body and making his heart pump blood faster through his body.
This power-up made him quite exceptional, however, as put by Rob Lucci, Luffy was chipping away at his life by using this power. This was especially true when he combined it with Gear Third, and even the Straw Hats believed that this was having a negative impact on his life force. Thankfully, after the timeskip, Luffy has mastered Gear Second to a level where he can activate it in just parts of his body to avoid facing the negative side effects.
8 Gear Fourth
Burns Luffy's Stamina and Haki Too Harshly
Just like Gear Second, Gear 4 is another power of Luffy that has an adverse effect on him. Gear Fourth is quite an incredible ability, however, the strain that it puts on his body is way too much.
This is especially true and Luffy overuses his Haki and spreads it all over his body. The Haki consumption and the rate at which it burns his energy is way too high, and eventually, it ends up paralyzing him if overused.
7 King Of Hell: Three Sword Style
Can Kill Zoro If Overused
Zoro's King of Hell: Three Sword Style is an amazing power. He utilized this for the very first time in his fight against King in the Wano arc.l While this power was certainly spectacular, it clearly needed a big trade-off.
Simply put, this power-up drains Zoro's Haki, and at the same time, his life force as well. If overused, it can actually go on to kill Zoro, which just goes to show the severity of it. Zoro completely leaves his Haki unregulated in this form, which means that Enma can suck up as much as it wants.
6 Devil Fruit Awakenings
Take A Toll On Energy In Some Cases
Devil Fruit awakenings are powers that can be considered to be key in the Final Saga of One Piece. Essentially, Devil Fruits have a level that can be unlocked by those who can push them beyond all those limits. According to Kaido, when the mind and body catch up with the ability, then, a Devil Fruit awakens.
Usually, Devil Fruit awakenings cost a lot of stamina, and end up adversely affecting the body of the user. This was confirmed by Luffy, through his Gear 5, where Kaido suggested that if he overused this power, he would actually die. It was also confirmed through the likes of Kid and Law, both of which said that they use their Awakenings as a last stand, when they had no other choice.
5 Monster Point
Cripples Chopper When Overused
Chopper's Monster Point is a very intriguing power-up that fans have seen on many occasions in One Piece. This power-up, while strong, does have its side effects as well.
One Piece: 8 Best Non Straw Hat Transformations
These non Straw Hats have amazing transformations in One Piece.
Copper used to lose the ability to move after utilizing Monster Point. Even worse, once he upgraded Monster Point and increased the time limit to 30 minutes, he suffered from a different side effect, which was being turned into a Baby Geezer.
4 Big Mom's Soul Sacrifice
Big Mom Removes Her Own Lifespan
To combat the threat of Kid and Law, Big Mom decided to showcase the true terror of her Soru Soru no Mi to them in Wano. Essentially, Big Mom decided to sacrifice quite a bit of her lifespan and consume it to gain further power.
When utilized, Big Mom grew tremendously in terms of strength and size. This version of Big Mom was strong enough to push back both Kid and Law in combat at once.
3 Hero Water
The Elixir From Arabasta
Not many fans of One Piece would remember Hero Water, which was introduced in the Arabasta Saga.
Hero of water was, simply put, an elixir that increased the strength of the individual consuming it manifold. However, the downside to utilizing this power was that in 5 minutes, the user would end up dying.
2 Dials
Some Dials Are Lethal To Use
While not all Dials can be considered to be dangerous to the user, there are some that certainly are. These usually fall along the lines of Impact and Reject Dials. Both of these Dials deal damage to the enemy at a tremendous scale.
However, they also have a very sharp recoil, which means that the user themselves feels a lot of pain that can potentially even dislocate their bones. This is especially true in the case of Reject Dials, which can obliterate the arm of the person who is utilizing it.
1 Energy Steroid
The National Treasure Of Fishman Island
Introduced in the Fish Man Island arc, energy steroids were known to be the Treasure of the Fishman Island. These energy steroids doubled the power of anyone who consumed them. The more pills they consumed, the more this bonus would stack. It is believed that by the time of the conclusion of the fight against Luffy, Hody had grown 320 times stronger than an average Fishman, which just goes to show how tremendous his level of strength was.
That said, these pills had a negative side effect, and that was premature old age. After overdosing on so many pills, Hody and his group were turned into old and dying individuals.
One Piece: 8 Characters Who Need To Upgrade Their Haki
These One Piece characters need to work on their haki.