Enputeiiseikon

An Enputeiiseikon (エンプティーせいこん Empty Soul) is a being that is more hollow, or empty than a hollow. These souls have no heart, feeling, or emotions. They have not likes or dislikes, they only protect themselves.

Creation
The souls are made from when, immensly strong and overwhemling vast ammounts of spirit energy is released in the Soul Society. As time go by the reiatsu released by vice-captains and higher, will form into something. The aspects or characterlistics of the reiatsu is removed and all is left is pure untamed spirit energy. The spirit energy reforms into a being.

Background
An Enputeiiseikon is rare normally one don't appear, but once every thousand years. The last one and the only know one to current exist is from the battle of the that was fought between, Ichigo Kurosaki and Sosuke Aizen in the Soul Society.

After, the release of immense spiritual power from them both, parts of it remained and after some time formed in an enputeiisekion

Abilities & Powers
Spiritual Power: These being, have spiritual power, normally very low as the bulk of the immense contentration of spirit energy is the body. However, as these soul is completely untamed it can develop the spiritual powers of almost any spirit race.