he abilities of the Nekura center on the summoning and control of this foul chakra of the Juubi's, that the clan calls "Keigoku".
The chakra is warped from the moon by a clansman opening the dimesional portal, through which the chakra enters the battlefield. This is much like a Summoning jutsu, which brings objects from a different place through dimensions. The portals can be opened anywhere on the battlefield. However, note that they cannot be used for transporting the user, opponent etc. over dimensions. Only Keigoku can transport itself through the portals. The portals are silent and do not actually count as a jutsu, however the release of a Keigoku technique from them is a jutsu; furthermore, it's not as if the portals possess any use outside of transporting Keigoku anyway.
The power of the Keigoku, however, is not to directly affect physical objects. The Keigoku is so corrupted, that it causes searing pain to an opponent's mind if they have been touched with the energy. Much like how prolonged exposure to a fire can cause extreme burns, prolonged exposure to high-rank Keigoku techniques can cause a complete shattering of the mind and possibly a vegetative state. This also lets the Keigoku pass through physical substances without minds, such as earth, water or trees to reach a target behind it, since it loses none of its powers on the non-sentient object. Should the Keigoku touch a Summoning, it will turn them against its master.
Skilled users of Keigoku have been rumored to shift its focus from merely shattering minds to bending them or manipulating them with even direct eye contact initiating a transfer of Keigoku between people. However, this can only be done by extremely high-level Nekura and requires special training from the Clan Head.
Similarly, skilled Nekura above a certain rank possess one of the most useful powers. The Drain. Once one of their Keigoku attacks have connected with the opponent, istead of letting their Keigoku dissipate, the Nekura bring the Keigoku back to them and pour the stolen strength from the opponent's mind into theirs. This firms up their mind, and even if they have injuries makes their mind pretend it isn't there and force the body to function as it normall would. Since this isn't really a cure, after the battle the Nekura will feel their injuries again plus an extra 25 damage points due to the strain of forcing their body. As many damage points as the opponent is hit with, that many damage points the user may force their mind to believe it isn't affecting their body.
Another side-effect of wielding the Keigoku is that any Bijuu, whether incompletely or fully transformed, believe the Nekura to be one of "them" since the Nekura wield the same chakra that the Bijuu were made of - just not in the same amounts. The Bijuu therefore refuse to attack the Nekura. Each Nekura is given a cloak strong enough to keep out normal weapons strikes.
An unwanted ability is that of the Nekura's bodies, after or during a battle, being so filled with Keigoku that they reject any foreign chakra from entering their body, and stop it instantly. This means that medical ninjutsu have to force harder to overcome the natural resistance, making Nekura extremely hard to heal, roughly three times that of a normal patient.