Core-Bound Cultivation

The MC pioneers a third way of cultivating called corebinding. Cultivators who chose to bind their core (energy pool) to a biological system (such as the nervous system, circulatory system, skeletal system, ect.) can use the system to more easily control internal augmentation skills, while also allowing the energies to leave the body to externally shape their energy. While this does come with a few drawbacks, like a reduced range for external skills and spells, and slightly reduced efficiency with internal skills and spells, it provides more versatility and flexibility. Cultivators that follow this type of cultivation fall under the spell-blade, paladin, druid, and other jack of all trade types of archetypes from games and media. 
Core-bound cultivation binds the energy root, or core, to a biological system in the body. The MC binds his psi to his brain, his Ki to his heart, and his mana to his cisterna chyli (a large lymph node in front of the spine and above the belly button). He then uses the nervous, circulatory, and lymphatic systems to carry his energy throughout the body and channel it outside of the body. This way he can use most of the internal skills, augmentations, and spells, as well as venting some of his energy outside of his body to perform external skills and spells.

Discovery

Discovered by the stories MC, after he didn't feel comfortable with either of the Systems provided cultivation types.

Applied Restriction

This cultivation system limits the range of external spells, and makes it difficult to perform some internal skills and spells depending on the biological system that the core is bound to.