WARNING: The following contains spoilers for Chapter #51, “Sacrifice,” of Boruto: Naruto Next Generations by Masashi Kishimoto, Mikio Ikemoto, Ukyo Kocachi, Mari Morimoto and Snir Aharon, now available from Viz Media.
Isshiki Ōtsutsuki has proven himself to be Naruto and Sasuke's deadliest opponent Boruto's most recent chapters. Not only does he boast an ocular jutsu that can shrink and store objects in a secret dimension, but he can also summon them back as weapons, which allows him to manipulate and absorb his opponents' chakra-filled moves as well.
Given how fast he is and that he can bend space-time too, Isshiki's had an edge over the Konoha heroes for some time, even with Boruto joining the battle. However, the latest chapter in the manga has now revealed a secret weapon that leaves everyone in even bigger trouble.
Isshiki wants to feed the wily Boruto to the God Tree so he can eat its fruit and upgrade further. But with Sasuke having the Rinnegan and Susanoo, and Naruto having Kurama, the Nine Tails Fox, Isshiki decides to play a chakra game of his own. He starts dropping down giant black cubes all across the secret realm as he continues to divide and conquer.
Naruto's been separated from his son, while Boruto's shielding a badly beaten Sasuke. However, Naruto can't get to them because Isshiki's cubes are sensory blockers. They prevent even Sasuke from reading chakra patterns, so his Sharingan and Rinnegan are more or less useless. This gives Isshiki the cloak he needs to conjure his moves without them seeing and, as Naruto can't sense his allies, the Hokage realizes they're handicapped. If they can't predict where Ishhiki will be, they'll be shooting in the dark, using moves that they can't be certain will land.
In other words, he's hiding himself in plain sight and rendering his attacks undetectable. And at the same time, he can monitor the heroes without them knowing what he's up to. Being invisible like this allows the ever sadistic Isshiki to toy with them but, admittedly, it's also a very smart move because Naruto and Sasuke are the most powerful chakra-users around, meaning Isshiki had to find a way to negate them.
Naruto and Sasuke's levels make them formidable warriors in terms of attack and defense, so Isshiki has flipped the table on themby deploying these cubes. And in a surprise move, he drops a bunch of them down on Sasuke, crushing him and badly wounding the Ranger. This is once more testament to Isshiki's character, as he has so many tricks hidden up his sleeve, matching his alien clan-mates Kaguya, Momoshiki and Kinshiki. But in Isshiki's case, he's untouchable and uncatchable as these blocks keep obscuring the shinobi physically and mentally. And the way he's hindered the Konoha trio, they're all sitting ducks that can no longer use chakra to their advantage.