Kotodama

The Kotodama is a unique seal created by Saisei Sano and placed upon his tongue. This seal allows user to mold chakra through speech by reciting specific verses or words. Originally Saisei was required to say the handsigns similar to the actual art, but eventually began developing the ability to mold chakra into specific words, making this art even deadlier. The average shinobi can say about 140-160 wpm (words per minute) about 1-2 words per second. Like handsigns this can also be accelerated or increased. Thanks to his chakra control and Sainogan, the rate at which Sai can process and act the information, he can speak at a rate most humans cannot reach. He can say about 900 words per minute and 15 words per second. He also can recite these incantations with barely any moth movement, most done by rapidly moving his tongue. Just like hand seals, specific words correlate to specific abilities; elements, distance, size and much more.

As shown with his training, the most tedious drawback is watching what he says, as any type of phrase can cause the seal to activate,