Hm ill expand on that a bit more
Essentially the main ability of the clan, we access this chakra we called Keigoku through the use of portals we open up. Think of it as a s/t hallway of sorts, one door is open on the moon, where the chakra of the Jyuubi travels through and another portal is open somewhere on the battlefield, in short wherever you choice to open it. We can only send Keigoku through these portals, nothing else. Opening a portal doesn't count as a move but seeing as to merely opening a portal does nothing and doesn't prevent a jutsu from hitting you, you can see it as completely useless unless you channel chakra through it in the form of a jutsu.
The Keigoku doesn't do any physical harm to a foe. Well, that's to say it doesn't affect the opponent's physical being. The Keigoku is a chakra so foul, so corrupt, that it rots away a foe's conscious and mind. Once contact has been made with a foe, even the slightest of brush against exposed skin, causes great agony upon their brains and mind, taken the concept of mental torture further than genjutsu can take it. Prolonged exposure can cause great damage to their brain, leaving the foe in a comatose like state until they receive training. Because it focuses on the actual conscious and soul of an object, it is able to pass through solid material, such as trees, buildings, waves, etc. However that all depends on the rank and experience of the user. A seer's Keigoku is unable to even pass through a door while the Clan Head on the opposite end of the spectrum can send his keigoku through something as large as a mountain range, depending on the rank of the jutsu used. If the Keigoku touches the mind of a summoning, it causes the mind to go through great pain, not enough to disburse, but enough to corrupt the mind, turning it against it's master, making it a temporary ally as long as it's on the field, depending on the rank of the technique.
Two of the strongest techniques of the clan, the Evil Eye transfers Keigoku directly to the face of the foe, causing intense pain near instantly. The Drain does exactly what the name says, drains the target of chakra and brings it back to themselves, powering them more and allows you to fight longer despite injuries you might have sustained. Of course, these jutsus are advanced and only the Cla Council and up can learn the Evil Eye and Possibly Black Knight and higher for The Drain, I'm not sure atm.
Due to the Jyuubi's chakra, the Keigoku, always surging through off, it makes it impossible to inject any form of foreign chakra inside of us, including Sage Mode, Curse Marks, Genjutsu, Jyuken, Kiyoshi and other techniques/abilities that might inject chakra in you (however attacks that use chakra as brute strength still work). It is due to this same chakra that Bijuu are unwilling to attack us, even in their incomplete forms. They associate our chakra with that of the Jyuubi, believeing us to be one of them. The Jinchuriki can attack us but his Bijuu will be unwilling. However, we can be healed after battles, once our body is worned down and defenses are lowered. They'll have to work 3 times as hard, likely using higher ranked jutsus to heal small wounds. Luckily, we have a very special cloak, that blocks most weapon strikes, including kunais and shuriken.
Got it?
shoutout lok for the cp