Melmoth was a riddle wrapped around an enigma. He first appeared as an old red dragon in Mount Anvilcrest as Melmoth the Flame Bourne. Guarded by a clan of fire giants and a contingent of salamanders, he had every intention of hoarding all the coinage and treasure that was now next to worthless since the Phyrexians conquered Sejanna. Guided by Eleazar, an old sage from New Haven, the Heroes of Crucibal penetrated to the center of the volcano and found Melmoth. In an epic battle, Melmoth was seemingly victorious until Seregval Kanodel became imbued with the power of his deity and with two, glowing white bastard swords slew Melmoth within moments.
His second incarnation was as Thanos the Eternal after Melmoth’s spirit took over Thanos’ scrying mirror.
A red-robed mage named Melmoth appeared in the city of Oracle two millenia later on the Isle of Evermist. There, he was the leader of a party of mages called the Rigidines. No one knows if he was truly Melmoth reborn or simply a mage who named himself after the dragon, but no one has seen him since Evermist collapsed into the Thalassic Sea over 280 years ago and so he is presumed dead.