Shadow History

After Infiltrating all those compounds, Shikamaru decided that he needs a new method to gain more information, the way things were he couldn't ascertain if the information he had obtained were tampered with and as such he decided to absorb the knowledge he's gathered and see if it is possible to change that. It took almost close to a year to finish the task, and he now had High-Jounin level reserves after compiling better methods of Chakra control and techniques to increase his reserves he had gleaned from the other clans, the Senju clan had even let him find information on how to sense natural energy and it had boosted his Shadow sense to cover close to a 3rd of the Village.

What was the most significant gain Shikamaru experienced was a technique called Shadow history, With the understanding he gained from Space-time techniques in the Namikaze and Uzumaki scrolls he was able to access what he'd like to call the memory of a shadow, a shadow never disappears its just changed to a different object and as such from a speck of dirt to a mineral to a sword, everything is recorded in a shadow. This technique allowed him to verify all the information he had obtained, but it wasn't easy to remove the information Overload, and he had almost had a stroke when he realised he couldn't glean the history from People with more Chakra than him. To mitigate the information overload from knowing everything about a persons life he had created an aspect in his mind, it was a deer would sort and remove anything he wouldn't need and only keep the information he requires, it has even been able to anticipate his need and as such his mindscape was an entirely autonomous existence.