The strength of the materialized soul was largely dependent on how strong the soul was and how much soul linking substance there was, as well as how widespread it was.
Even a normal person would be able to complete this operation as long as they somehow followed the appropriate procedures, for example, having an especially long death process.
As long as one's constitution, soul, and environment met the requirements, anyone could create a special type of soul lifeform by using certain means.
"Intense emotional fluctuations, combined with a long death process will make a dead individual's soul linking substance spread continuously, and as long as the environment is suitable for the soul, anyone would be able to achieve soul connection. However, this process of accidental suitability would leave the newly-born soul lifeform with a lot of drawbacks"
