For ten points, name this redeemer figure from Islam, who will appear before the end of the world to defeat error, injustice and tyranny.
According to one group, this figure is the same person as their leader az-Zaman, who is nicknamed "The Master of the Age". This figure and those loyal to him march under a black standard, and enemies of this figure include the tribe of Kalb, whose leader kills women and children by ripping out their stomach and is known as "the Sufyani". This figure is the chief enemy of the Dajjal, a villainous false messiah, and this figure's face is expected to appear in the moon and the black stone of the Kabba upon his coming. For ten points, name this redeemer figure from Islam, who will appear before the end of the world to defeat error, injustice and tyranny.
According to one group, this figure is the same person as their leader az-Zaman, who is nicknamed "The Master of the Age".
{Mahdi} [accept “{12th Iman}” or “{Occulated Iman}” until “{black standard}”, as the {reference} is to those {who believe} that the {12th iman} is {also} the {mahdi}]