I aim to present the reasons why I think that the birdcage used by Doflamingo is the worst plot device in One Piece, as well as one of the most inconsistent uses of DF. I'm not sure where is the most adequate place on the forum to post this, so I apologize beforehand for the possible misplacement. I will briefly sum up Doffy's feats regarding the birdcage: - The birdcage surrounds the entirety of Dressrosa and has strings close enough to eachother to stop a person from simply slipping between strings and escaping the birdcage. - The birdcage is seemingly unstoppable even when pushed against by hundreds, if not thousands of people, including extraordinary folk like a giant and a marine admiral. - The birdcage has seemingly indestructible strings, since no one could damage it even by a little bit. - Doffy can mantain and constantly contract the birdcage while he is focused on combat, attacking, getting hit, getting flown away by G4 attacks, etc. Okay. You may point out other significant feats, but regarding my analysis this is more than enough. Concerning size and number of strings: we have seen few examples of really high magnitude DF use. The most recent example is Streusen turning the collapsing Whole Cake castle into soft ingredients. That is coming from someone that has his DF for at least around 60 years. Pretty impressive, yeah. I think of Magellan, because he could create a very large amount of poison very quickly. There is also Kuzan freezing the giant waves created by WB. But beside someone like Whitebeard, whose DF was OP as all hell and high magnitude by itself, I can't think of many cases of really high scale DF usage. And then...comes the birdcage. The DF ability with the biggest radius and maybe even the largest volume of created matter( this is very speculative, but those are very tightly packed strings over a massive radius) shown thus far in the series. While Dressrosa is not that big of an island, it is by no means a small island. The birdcage must have been several Km in radius, especially considering how high up into the sky it went. Very impressive feat from Doffy to say the least, but not really the main issue I have with the birdcage. The last feat I listed is impressive as well, but other characters have been shown using their abilities almost involuntarily while in combat or similar activities. For that reason, I will skip it. My main issue with the birdcage is about the two "raw power" feats. Unstoppable and indestructible. Reading the Dressrosa Arc, I never had the impression that Doffy's strings could not be destructed. In fact, he imbued them with haki in order to harden them and damage certain characters. The strings are not like Barto's barrier, which is seemingly indestructible even without using haki to harden it. On the other hand, the strings also weren't shown to have such force when used in combat by Doffy's body that they could simply send people flying even when they pushed against it, or braced themselves to tank the hit. So how in the seven hells could the birdcage tank hits from major players in the arc? If they were imbued with haki, meh, maybe. Considering a character like Fujitora was present, who debatably should have better armament haki than Doffy, he could have cut the birdcage and freed the people he wished to save in the first place. But even if that was not the case, with G4 we discovered that one could run out of armament haki. Would Doffy really have so much armament haki that he could use it on every string of the massive birdcage while fighting? I think not. So the only explanation to the birdcage's resistence is plot armor, the best haki there is. And how could no amount of people stop the birdcage's movement? They hinted that they could be slowing it down, but as I stated previously, there is no indication that the strings are driven by some mystic unstoppable force and have like infinite mass or something, so they should obviously be stopped by someone like effin' Fujitora or Hajrudin. Think about it: if you can't destroy or stop the birdcage, why didn't Doffy use it on his opponents? Why didn't he surround people with a tiny spherecage? I imagine the only two people in Dressrosa who would be capable of surviving it are Bartolomeo and Law. But if Doffy was really specific with the cage, he would just summon it around their heads and quickly compress it, giving them no chance to defend/teleport against it. Hell, why doesn't he just kill Kaido if he has such an overpowered ability? Because the birdcage SHOULDN'T EXIST! It serves merely as a plot device coming out of nowhere, without any basis in the expectations that Oda had set for us until that point. It led to some of the worst drawn out parts of the already long Dressrosa Arc, and really should have never happened. I wish Oda had come up with a more reasonable way to neutralize the characters he had to neutralize, give us a sense of urgency and tension, and pressure Luffy into going all-out against Doffy. Please, leave your thoughts regarding the birdcage and my assessment of it. The critique can be expanded further, but I don't have the time ATM. Cheers!