Blossom ghost

"Mr. Gzhongk, how is it possible you lived for so long and still remember everything?"
"It is a secret I myself am a sole guardian of. So far there were many who understood at least enough of it to make some use of it. But noone except for those who found it many centuries ago were able to comprehend it completely."

Grandpa Gzhongk answering one of his students

Description

Blossom ghost is the ultimate final stage of Blossom ghosting. Where Blossom ghosting causes parts of a person to be made by the Blossom element. Blossom ghost is a description for someone who no longer has a single cell in their organism and instead is made completely by the Blossom.
Such a person either posses titan level willpower and focus or found a means to continuously absorb a large amount of fresh Blossom. Possibly both.
It could be easily said that the person in question is dead, and what is seen is their soul, taking shape via the Blossom element. The only person who is known to exist in this state continuously is Grandpa Gzhongk, who wanders from Atocite to Atocite and teaches young Raiders how to properly control the Flow.
The marvel of this state is that as long as the person knows their own biology well enough, they become literal gods of their own body. They can make their body not need much of a sustain, or they can make changes to their bodies at will. The damage to the body becomes a mere nuisance, as a bit of a focus can fix wounds otherwise fatal for normal mortals.
The body in this state is not indestructible, it still operates on rules very much the same as the original body. But it became versatile thanks to the fact that it entirely made of element able to mimic properties of anything around it.

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Discovery and mastering of the concept

Many people, who suffered Blossom ghosting died when their body consisted of Blossom by a larger majority, compared to normal cells.
But about 400 years after the Cataclysm, a group of people found a way to survive and become completely made out of Blossom. These people believed that their will and mind reside not within the body but within their soul.
This concept became the base from which their thoughts lead to the realization, that as long as they stay in control of the Blossom slowly making their bodies, they could live on in a different, yet same way. Many died in the attempt, and only a handful succeeded. And from these handful few, only Grandpa Gzhongk is still accounted for.

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Go ahead and tell them. Tell them all for all I care. Half of them will not understand half of what this is all about, and the second half will either die trying or dont even bother trying.

Grandpa Gzhongk to Council of Planners

Dangers and reason behind the secrecy

Even though having absolute control over one's body sounds like a great ability. The required knowledge and understandings to become Blossom ghost are not easy to fully comprehend. Not only one needs to perfectly understand how their body works, but they also need to perfectly understand the Flow and the Blossom.
Being completely made out of fleeting element comes at a great price.
Periodic meditations to focus on one's body's form are just the beginning.
If one were to wander in their meditation away from focusing on their form, they might as well disappear on the spot.
It is a great risk, and many of the original Blossom ghosts found their demise this way. But the remaining ones found an alternative way.
Consuming or absorbing the Blossom element to ensure their own stability.
This, while being a viable option, is also as risky as meditation. What is even worse, is the need to periodically absorb some amount of Blossom to make up for the tiny amount that dissipates from their bodies constantly.
However, getting to Blossom means risking exposure to raw Corruption. And because crystalization happens whenever The Flow comes into contact with Corruption, it is better to just commission the Raiders to bring up some Blossom, than risking becoming a human sized crystal oneself.
The fact that it is not easy to become a living, stable Blossom ghost and the presence of many hardships of maintaining such form are the main reason this is not a widely spread piece of knowledge.

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"So you lost your left arm, that dude lost its hand and that girl her eye? How for the sake of Flow are you still capable of Raiding?"
"Magic"

A joke occasionaly said before the Raid.

Usage in practice

Even though the concept of Blossom ghost is hard to apply in full, it still can be used partially. It does require an intelligent person to understand the core behind what Blossom Ghost is, but it rewards the individual with the option to temporarily recover lost limbs, or heal critical wounds.
This way a person uses a great amount of Blossom Flow to create what was lost or damaged. And later intentionally and willingly let the Blossom dissipate. Not doing so would cause them to suffer Blossom ghosting, as they consume Blossom to maintain the recovered parts.