Some of the Box Arts can be used by human summoners directly. Only those related to the manipulation and creation of poison are banned from being used by humans.
Okay so, let's do Haki.
( Kouton: Haki) Box Arts: Haka
Rank: D-S
Range: Short-Long
Chakra Cost: 10-40
Damage Points: N/A
Description: Haka stands as an enhanced form of Killing Intent (Sakki). Works in all manners exactly like it, overpowering one's mind and paralyzing the targets with images of their death and torture, with the exception of one simply thing. Along with the chakra, the user secretes a fast wave of venom in it's gaseous state. This chakra-modified venom focuses solely the secondary effect of Irukandji syndrome, from the venom used by a certain specie of box jellyfishes, which is a sense of impending doom. While the Killing intent is chakra based only, thus easily overpowered by will alone, if the opponents are as strong as the user, Haka creates an added physical and physiological response to it, preventing even targets as strong or stronger than the user to break it by will as easily, having them suffer the same paralysis as if they were 2 ranks bellow.
*The venom wave only reaches Mid-range, thus the Haka continues as normal Killing Intent for longer ranges*
*Human users can't preform this technique, but the strength of Haka is based on the summoner's rank*
*The higher the user, the stronger the technique*
*Haka lowers the Target resistance to Killing Intent by 2 Ranks, even in bios that claim to be fearless*
*Venom produces ONLY the sense of impending doom. It has no Hemolytic of Digestive proprieties, neither does it produces pain*
*The user can control the Haka in order to not affect allies, even in radial uses*
*This technique is basically only a stronger version of Killing Intent (Sakki)*
Okay, as I understand, this is just a advanced version of Haki right?
Normally Irukadji causes cardiac arrest. But here it only gives a sense of impending doom?
Human summoners cannot use this.
Is the venom (gas) colored?
Also, If I use this against someone of Sanin ranked, I treat him as someone of Jounin class(for Haki)?