The Deadly Alliance Insignia is a sinister emblem featuring a central skull motif with two crossed swords behind it, symbolizing unity in destruction. The insignia is crafted from dark, aged metal with a matte finish, showcasing intricate engravings of serpentine patterns around the edges. The skull's eyes are inset with small, glowing red crystals, giving it a menacing aura, while the swords appear slightly worn, hinting at past battles.