its one of the Saijo O Wazamono it is said to be able to bring people back to life, that has yet to be seen. It is able to control a type of blue energy and nature. it is said to be stronger than Mihawks Kokuto Yoru. It is also triggered by will and faith if you dont have those two capabilities u cant unlock the full potential abilities. It was given to "Purple Haired" Alexander D Rose from his father the famous pirate Jonathen D Rose.