Dragon lily poison is the most common poison used by ninja, the more chakra the victim has the stronger the effects of the poison. Despite it's powerful effect, its lethality rate was surprisingly low in combat.
The plant could survived in nearly any environment and self polonated quite rapidly to the point that farmers considered them pests as they outcompeted with their crops.
Because of how common this plant was and how deadly It could be, it was taught in the academies about it's affects so even young genin understood what was happening and the antidotes for this poison was carried by nearly all ninja. After the third ninja war, the death toll from this poison had significantly dropped as it was a mandatory to carry a couple antidotes in their storage scrolls.
Despite the knowledge and abundance of antidotes, there wasn't enough for the large and spread out population of Konoha!
Flying above Konoha, Chiba's mind was going haywire as he saw a fog of poisonous mist originating from the sewer pouring into the village. He saw metal canisters had been placed through the sewer of Konoha as it poured out the white mist that flooded into the plumbing of house and the manholes in the streets, poisoning everyone in the village!
He wanted to use his graviry to crush the canisters but realized that would only intensify the problems as he could only helplessly feel the intense emotions of pain and agony while watching tens of thousands of faces contorted in misery in clear vision.
Chiba was momentarily stunned by all of the suffering he felt and saw when he suddenly flew at insane speeds towards the Uchiha district of Konoha.
Chiba saw that the Uchiha clan and it's immediate surrounds had nearly three times as much poisonous mist as the rest of the village!
Without wasting a second to spare on opening his door, Chiba bursted through his house and saw Koizumi collapsed on the floor coughing up thick blood as she crawled towards Chiba room, she was barely moving as the poison was quickly killing her.
She knew what was happening but she didn't have any antidotes as she hadn't even graduated yet, but she desperately crawled to Chibas rooms in hope that he had one.
Raising his hands up, the wall to his room suddenly smasher downward as a white pill flew out of his room and down Koizumi's mouth in an instant. With his Haki at full power, he expertly began to control his devil fruit to break down the pill so that her intestines absorbed them quicker.
With a face full of sweat, Chiba watched intently as the antidote entered her bloodstream and washed through her body, counteracting the poison.
Seeing her face getting better, Chiba knew she would make it and wanted to let out a deep sigh but couldn't as he was holding his breath in the poisonous mist.
Picking his sister up, Chiba flew out of the hole he made in the ceiling and flew above the thick white cloud of poison to finally be able to breath.
Flying above, Chiba didn't even need to use his Haki to understand the pain and misery going on below as the civilian and weaker ninja were screaming out in agony, the poison wrecked their bodies from the inside out.
Landing at the front of the village gates, Chiba placed Koizumi down as he used his Haki at full power and concentrated.
Uncoordinated ninjas were trying to use wind jutsu to clear the thick poisonous fog, only for it to not make a difference. The moving fog wasnt a natural phenomenon and continues poisi9n must kept being expelled from the sewers, Chiba could 'see' the Hokage exited his building and took charge of the situation.
Minato realize they had to stop the mist at the source and sent out teams to do so while having the rest of the ninja spreading out their antidotes to the civilians.
Despite doing their best effort, Chiba knew that the village couldn't hand out the antidotes or stop the poison in time before thousands die. Chuba already saw the elderly starting to succumb to the affects of the poison and passing away, not to mention every ninja wasnt a sensory Ninja and Konoha was a large place, some civilians were bound to not be found.
With a solemn face, Chiba raised his two hands in the air.
'This wouldn't have happened if I hadn't intervened, I have to help.'
As that thoughts passed his mind, buildings in Konoha began to smash open from either their walls or roof, giving Chiba access to the injured. Every ninja looked around in horror, wondering if someone had planted bombs alongside the poisonous mist.
As they started looking around wearily, they were shocked to their core as they saw thousands of humans beginning to levitate in the air! They watched in shock at the people flying above the cloud of poison and to the front gate of the village.
The well trained ninja recovered from their shock as they ran to the front gate of the village, only to realize they couldn't find or sense or see single civilian along the way!
With a flash of yellow light, the Hokage arrived at the villages from gates only to be greeted by a seven year old Chunin who had both hands in the air as the posioned civilians began landing in an organize row ranging from those in need of immediately treat to those relatively fine.
Being the only person that was standing and with his hands positioned in the air, Minato and the newly arriving ninja instantly deduced that Chiba had done this.
"Those who can't use wind Jutsu start handing out antidotes! Those who can use wind jutsu, rest and save your chakra for when the source of the poison is taken care off. Kakashi quickly gather a team, I'll use flying Raining to teleport them to the land of medicine to obtain more antidote pills from the..."
With all of the civilians out of the village and all of the ninja convening at the front of the village gates, Minato could finally let out a slight sigh of relief as he began to take control of the situation now that everyone was in one place.
Looking around at the tens of thousands of humans, some vomiting blood and others quickly administering medicine to those who needed it them most, Fugaku saw Chiba standing alone at the outskirts of the forest that surrounded Konoha and walked over.
As he neared closer to the boy, Fugaku felt a chill run down his spine as he saw the veins on Chiba's face bulging as the boys teeth were gritting so hard that you could hear it from a few feet away.
The boy 'watched' helplessly as Orochimaru and his clones ransacked the village, taking the forbidden scroll in the Hokages office and dozens of other scroll from the village and clans.
This angered the boy, but what enraged the boy to the next levels was that the bastard Danzo, who created this poisonous mist, was sitting deep underground and also commanded his root ninja to obtain the secret jutsu from clans and to gather any information that they could use for black mail!
Chiba could only swallow his anger at Danzo's actions, that being said Chiba also knew that this was also an opportunity for him.
Chiba began to unfurl and started reading the protected jutsus that usually had guards stationed nearby and hid them before Orchimaru or Danzo could get their hands on them.
Unfortunately Orochimaru already had taken Konoha's forbidden scroll but thankfully it would take the snake a few minutes to bypass the vaults and safes that the clans use to hide their scrolls. Chiba used that time to start reading and commiting the jutsu to memory, making sure to learn about the actually useful jutsu like the Hyugas caged bird seal and Akimichis Butterfly mode.
At this point, Chiba was confident that he had all of the jutsu he'd ever need in the future, he just needed the chakra to learn them.
"Chiba, we've removed our enemy's right hand man and weakened them, we just need to bide our time while sharpening our fang..." Fugaku said trying to console the angry Chiba.
After hearing about what his son would do in the future, Fugaku was at a lost on who to make his successor for the clans patriarch. He knew he couldn't let someone like his son, who could willingly kill the entire Uchiha clan down to the even the youngest baby, be the leader of them.
From the rage that was visible on the boys face, Fugaku knew that Uchiha clan would be safe in his hands as he knew who he would choose to become the next Patriarch whenever he decides to stepped down!