Tsunade asked Ren "do you even have an idea on what you have done"
Ren:"I just combined natural energy with water and earth chakra" replied Ren innocently.
Tsunade having no idea what to do, told Ren about god of shinobi hashirama.has how he was the only one to ever posses wood release and it is considered as one of the strongest kekkai genkai .
Ren already having knowledge about pretended to be interested in what tsunade was saying . Seeing Ren's interest tsunade continued to tell him about hashirama about how he defeated the strongest uchia 'madara uchia' during warring states period .how he had captured all the tailed beasts using wood release due to its chakra suppressing ability.
Tsunade then went on to tell about how hashirama was the one distributed the tail beasts to every village and how he lost his life in first great shinobi ninja war while defending an entire army in order for the konoha force to retreat and later hashirama died due to chakra depletion .nobody could kill hashirama due to his large chakra reserves ,his regeneration and his wood release .
Then tsunade led to a different sealed room within senju compound .where in the room there was two wooden pillar with tittle and name written on them 'first hokhage hashirama senju' and 'second hokhage tobirama senju'.
Ren did know about them being his grandpa and grand uncle similar to tsunade but he didn't know about the way in which first hokhage lost his life has Ren only concentrated on watching main timeline episode he left of lot of fillers,movies and theories related to Naruto world.
Tsunade then turned to the pillars and said this is just a way of honouring them.obviously Ren knows as the bodies of first hokhage and second hokhage is not here.
Then tsunade turned to the second pillar and told that is our grand uncle tobirama senju the strongest water jutsu user.he ruled with iron fist .but he also lost his life in first great ninja war where he was ambushed bt hidden cloud ninjas a team of special elite force led by kinkaku and ginkaku.he is the person who has created most of the jutsu used in tadys time.
After saying this tsunade was staring at the pillar with a look of melancholy .not knowing what to do to break this atmosphere Ren was also staring and pillars and began thinking about what to do next.
Suddenly tsunade got out of the stupor then looked at Ren and then told him"now we both are the last senju's we have to bring the glory of senju back" hearing this Ren started looking at tsunade and having some dirty thoughts but quickly broke out of it.
Tsunade did not notice this then she told me to never use wood release outside senju compound and only use it when she gives me the permission.after saying we went out and tsunade again sealed the room .as soon as she came out the first thing tsunade did was the kick out some of the guarding shinobi's of the senju compound she kicked the guards on whom she had even slightest bit of doubt.sone of the guards who were spies from root din't go out staing that it was hokhage's order to guard the senju compound .that was until tsunade threatened to turn their face into meat paste the spies where reluctant to go back without following the orders of danzo ,but seeing tsunade was serious there was no other way but to go back and report it.
Swish swish....
They all went away without looking back ..
There was now only few shinobi and civilians whom tsunade trusts and knows that they are loyal to the clan within the senju compound now.
Then tsunade went to the a seperate room and brought out a scroll which contains all the details about wood release by hashirama senju.
It included the basic exercises and how wood release become strong when used in conjunction with senjutsu. After reading it once he handed back the scroll to tsunade but tsunade told him to keep it and practice untill the academy opens then tsunade went off to the hokhage's office to know what to do .
Ren then began to see what to do first. the basic of wood release is to somehow manipulate and try to bring a root out of already presents plant outside and manipulate it and also elongated it but Ren goal was to be ready to be able to bring out a trees root and being able to manipulate it before beginning of the academy which was just six months away .....