Hinjutsu

Hinjutsu (火の鳥術 Phoenix Technique) refers to a specialized field of jutsu use by the Tenno Clan. It can only be used by Tenno Clan members who can summon Phoenixes and Fire Release Ninjutsu. The user gains special chakra known as "Hinjutsu Chakra" (火の鳥術チャクラ Hinjutsu Chakra), and they gain the ability to sense chakra similar to users of Senjutsu. 
This new chakra enables the user to enter an empowered state called Phoenix Mode, which can then drastically increase the strength of all ninjutsu, genjutsu, and taijutsu, and enables the user to use Imijutsu.