What are the special abilities of the Fullbring Zangetsu Sword?

The Fullbring Zangetsu Sword has several special abilities, including:

* **Absorption:** The sword can absorb the spiritual energy of other objects, making it more powerful.
* **Release:** The sword can release the absorbed spiritual energy in a powerful blast.
* **Enhanced Getsuga Tenshō:** Ichigo can fire a more powerful Getsuga Tenshō from the tip of his sw