Being the last son of Makuta, Mukraatan is the heir to the throne of shadows.
About this creation
As the deadliest son of Makuta and the main evil on Kueva-Nui, Mukraatan is feared even by the Toa Kueva. Using his Scythe of Shadow, he can taint the minds of matoran and slaughter just about any opponent.
The taint can be removed, but it takes more power to do than with Sidi-Koro's plagues. Mukraatan is possibly even more dangerous than Makuta and will take the power of all three Toa of Judgement to defeat him.
Half rahi, half spirit, pure evil, just like I said.