Chapter 217:
The Flying Thunder God Technique, a space-time ninjutsu capable of instant teleportation.
As long as the user places a Flying Thunder God mark somewhere, they can traverse any distance to that point. Newly carved marks retain a strong spiritual connection with the user, allowing them to teleport no matter how far away they are. This was evident during the Fourth Great Ninja War when Minato Namikaze used the technique to transport Terumi Mei, the Fifth Mizukage, across several countries, a journey spanning thousands of miles in an instant.
However, the power of the Flying Thunder God mark isn't permanent. Over time, its spiritual connection to the caster weakens. As the power diminishes, so does the range of the teleportation. In some cases, if the mark becomes too faint, the connection can completely vanish. Even standing right next to the mark won't let the user detect it unless they test it manually.
This limitation was evident during the original attack of the Nine Tails, when Minato fought Obito. The Flying Thunder God mark he had placed on Obito during that battle remained intact for years, but Minato didn't recognize it until much later, only confirming its existence through trial and error.
Returning to the present, Orochimaru's kunai had just been thrown.
Freshly carved and brimming with power, the Flying Thunder God mark could easily bypass the sensory barriers of Iwa Ninja Village. These barriers were only designed to detect objects infused with chakra, but the Flying Thunder God mark was purely spiritual, making it undetectable.
Using the kunai as an anchor, Orochimaru was able to infiltrate the village without being noticed.
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In the ninja world, aerial defense and detection capabilities were sorely lacking. Ninja villages had almost no effective countermeasures against airborne threats.