Akuma no Momaku or Demon Retina

Akuma no Mōmaku or Demon Retina is a kekkei Genkei for this story, [link] . It is constantly on sense it is light sensitive, so even in more darkness she can use it. The effect of the Demon Retina is that any elemental chakra the victim has the user has temporarily. If the user absorbs enough chakra from one victim until the victim becomes unconscious then the user has so much of the victims chakra that the user's chakra will permanently have the chakra element of the victim. So similar of a signature that the two will have a constant feel for each other and use similar jutsu. If there was a kekkei genkei then the user has the kekkei genkei temporarily. Lastly, if ever a victim is absorbed to death then the user shall literally absorb their soul. If multiple people were killed from it, then the user will have the chakra equivalent of demon host and will have some of the benefits of a demon host like chakra cloak and other benefits. The Demon Retina is considered a legend by most, until it is found in the land of Waves.