Akuro Akuro no Mi

Introduction
The Akuro Akuro no Mi is short for Akurojin-no-hi Akurojin-no-hi no mi. The Akuro Akuro no mi is a devil fruit that gives the user the ability to produce the legendary Akurojin-no-hi flames. These fires do not burn you physically but burn away at you spiritually. Anybody who does not flee from these fires will become gravely ill and in many cases die.

Weaknesses
The user suffers from standard Devil Fruit weaknesses.

Source
http://en.wikipedia.org/wiki/Akurojin-no-hi