Su Que attempted to separate out around a thousand Affiliated Demon Seeds from his Lifebound Demon Seed.
In the history of the Martial Arts, those who cultivated the Dao Heart Demon Planting Technique typically only separated three Affiliated Demon Seeds, which was considered the limit.
Firstly, because their Spiritual Power was too weak to manage more Demon Seeds.
Secondly, because even if some had strong Spiritual Power, their resolve was weak. When too many Demon Seeds were sent into Furnaces, the emotions, desires, and Heart Demons that arose during their cultivation could overwhelm the cultivator, leading to Qigong Deviation and total annihilation.
However, Su Que possessed a level of Spiritual Power unmatched by even the Early Stage of Tribulation Seed Realm martial artists, and he had the ability to reverse the side effects.
