Breaking through Foundation Establishment, there are three gates to overcome.
The first is the Physical Gate.
When impacting the Foundation Establishment Stage, a large influx of Heaven and Earth Spiritual Qi fills the body, demanding extremely high physical requirements.
The requirements here are not just the strength of the body, but also the vitality of the blood and the durability of the meridians.
If the body's strength is insufficient, it cannot withstand the influx during breakthrough, and those cultivators who fall during Foundation Establishment do so because their bodies can't handle it, resulting in their demise.
If the blood's vitality is insufficient, then during the remodeling of the body upon reaching Foundation Establishment, the blood cannot be perfected, leading to a failed remodeling.
The reason why the probability of breaking through Foundation Establishment decreases with age is that the aging of the cultivator reduces the vitality of the blood.
