The reason your stamina goes down to begin with is because of acidic build up around your muscles and also because of energy consumption. So young Oak managed to use herbs that had a trace of spirituality to guide ki he consumed to slow down the rate of acidic build up.
'Rather crude methode, but if my parents or the elders learned of this, they would have never let him leave. After all, the Raging Tyrant art is a grade 6 martial art. After all, with only hints, I managed to modify it to this degree and with having poor theoretical knowledge, which is a perfect opportunity to make their family art. Unstoppable Tyrant Body art is a grade 9 martial method.'
Oak then thought about how he could use Ki or Qi to further improve it. He then slowly fell asleep thinking about it.
The next day, Oak woke up feeling refreshed. After all, he did feel like he woke up in another world when he awawkend his past memories. But that didn't stop him from looking at the Immortal Root sensing ceremony.
He quickly got out of the wood and fur covered bed he made. He got into position and started to meditate. His vision faded into this abyss like black.
'So this is what meditation is like? It's much different than Earth. It feels that if I become one with the world and their secrets are mine to discover. Maybe it's because of that Immortal Root sensing ceremony. I will need to make or find a meditation technique that allows for this.'
What Oak doesn't realize is that this degree of meditation is extremely different to attain and usually clans and sects prepare special candles that allow for a deeper meditation.
Oak then tried to sense his immortal root in this empty space. After a bit of time, he sensed a green speck of Qi and followed this speck for what felt like a lifetime. Then he layed his eyes on his Root.
If it was without his past life's memories and changed personality, he would have been immensely disappointed. His Immortal Root was a plant or, more accurately, a seed it was green in color and had many different types of plants woven into it. It's over all shape was a green seed, and you could have seen different colors beneath the surface. You could tell it was an Immortal root because of the white specks of Qi that was getting absorbed by it. Oak was quite fascinated by this it was like a beating heart.
Previously, Unawakened Oak wanted an attack orientated Immortal Root, but now Oak was quite delighted by this. Simply because this is a rather rare type of immortal root.
Immortal roots are divided by type, grade, and rank. Take oak. For example, he had a plant type immortal root. This is rare because it's part of the life type of immortal roots, which is rather rare, not as much as life attribut but up there. The benefits include having an easier time with enlightment toward anything plant related.
Grade is divided into 12 grades, just like how there are 12 cultivation ranks. Higher the grade, the easier it's to reach higher cultivation levels. A Grade 2 root will allow you to reach the rank 2 cultivation level easier while also providing many different benefits like having greater control over the attribut of your Immortal root and having a supression effect over lower ranked immortal roots.
The rank is the power of your Immortal root while it's extremely difficult to improve the grade of your root strengthening it is much easier. You either need to absorb Qi or anything related to your root with the proper refining methods.
Oak started to look all over his immortal root, his eyes shining brighter and brighter. This root changed many plans. First, the grade of this root is 2, and you can tell by the Qi runes that cover the root. In a single rune, there were 2 marks that Oak seemed to recognize.
'Wait, this rune doesn't this look like a lotus? Wait a minute, all these different plants they all from earth? Does the Immortal root embody the knowledge of someone?'
This poured a bucket of cold water on his desire. What of some freak of an elder see his immortal root. A bunch of strange plants that don't seem to come from this region. Wouldn't they get curious? Oak would.
'Maybe of I study the plant life around me it can change the look of my Immortal root.' After a little bit of looking, he got out of meditation and sat up.
'So that's what Qi looks like. There are so many different colors it's kinda like that one ad tastes the rainbow motherf^cker.'
Oak saw the world in a completely different way. Life was way more vibrant. Qi of many different colors floated around it was a magical sight if he had been like living in the slums of earth for years and then arriving in beautiful magical forests. Even though he was still in that cave, it was much better than before he sensed his immortal root.
'Thinking of earth is that ability still there? If I remember correctly.' Oak then closed his eyes and focused. Before he died of old age, he lost vision in his eyes suddenly, and no doctor was able to figure out why. Then, when he was on his deathbed or more accurate chair, he suddenly got his vision back, and his eyes had a weird symbol on it. But before he could figure out what was going on, it seemed that sudden switched in vision caused him a heart attack, which killed him.
He vividly remembered that feeling. Then he felt the Qi around him rush into his body, but strangly, it was warm and calm like a message that beat out the stress in every part of his body. Then it rushed to his eyes, and the feeling immediately knocked him out. His breathing steady like he was in deep sleep.