Ultraspeed Regeneration

Ultraspeed Regeneration (超速再生) is an Extra Skill that is the enhanced version of Self-Regeneration.

As can be seen, by the name, it grants the user incredible regeneration properties, far superior to Self-Regeneration. It's considered equal or better to the Orc Disaster's Regeneration combination of Starving Ones + Self-Regeneration, which was implied to require the destruction of the entire body on an atomic level to beat.

However, the regeneration is blocked when a wound has been caused by Spirit Particles, for example via Disintegration. Also, damage done to the Spiritual Body can just bypass the regeneration itself altogether.