Senkunome

The Senkunome (Kanji: せんくのめ, English: Precursors' Eyes) is a dōjutsu which came into being as a direct result of Daibadatta's utilization of the Endless Cycle of Rebirth Through the Three Worlds of Past, Present, and Future Existences (Romaji: Sangairuten, Kanji: さんがいるてん).

It only lies dormant within the reincarnations of Daibadatta. And each of Daibadatta's reincarnations are only capable of awakening it by coming into possession of an inflexible opposition towards the very idea of the Unification of the Ninja World.

Capabilities
Once it has been awakened, the Senkunome can be activated or deactivated at its possessor's discretion. Upon activation, the Senkunome will pervade its possessor's Chakra Pathway System with all of the chakra that the possessor has inherited from his or her previous incarnations. As a result, the possessor's reserve of chakra will be augmented to a vast extent. The possessor will also assimilate the memories, experiences, and sentiments of his or her previous incarnations.

Advantages
An activated Senkunome will bestow upon its possessor an immense pool of chakra which he or she can utilize to fuel the performance of an innumerable amount of jutsu. By the time of Ko Urashima's birth, the aforementioned pool could be comparared even to the extreme volumes of the Tailed Beasts' stockpiles of chakra.

It'll also allow the possessor to both recall information that was known by any of his or her previous incarnations and perform an activity with just as much competence as any of his or her previous incarnations could. Essentially allowing the possessor' to adopt the jutsu of his or her previous incarnations.

Disadvantages
Activating the Senkunome doesn't only grant its possessor the assets of his or her previous incarnations. Rather it also grants the possessor the liabilities of his or her previous incarnations as well. Such liabilities include:
 * Any memory of a previous incarnation that burdened the previous incarnation will burden the possessor as well.
 * The possessor will exhibit all of the bad habits of his or her previous incarnations. *The possessor will adopt the ideologies of his or her previous incarnation as well. Regardless of whether or not those ideologies conflict with each other.
 * And the emotions of the previous incarnations will carry over to the possessor. Causing those possessors that lack self-control to become absurdly moody.

There is also the fact that the possessor will not inherit the genetics of his or her previous incarnations. Thus almost everything that is related to those genetics will be completely useless to the possessor.