Step inside Cormega’s Hummer H2, and the vibe instantly shifts from rugged to refined. The spacious cabin boasted premium leather seating, offering unmatched comfort even during long drives.

The events surrounding “The Testament” had never happened before in hip-hop music. It was 1998. Hardcore rapper Cormega, a longtime Nas affiliate, was signed to rap’s biggest label, Def Jam. But after ...