Orcus

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This demonic humanoid is squat and bloated, standing nearly three times as tall as a normal human. It goat-like head sports large, spiraling ram-like horns. Its legs are covered in thick brown fur and end in hooves. Large powerful arms wield a wicked skull-tipped wand. Two large, black, bat-like wings protrude from its back and a long, snake-like tail, tipped with a sharpened barb, trails behind it. 

Orcus is the Prince of the Undead, and it is said that he alone created the first undead that walked the worlds. Orcus is one of the strongest (if not the strongest) and most powerful of all demon lords. He fights a never-ending war against rival demon princes that spans several Abyssal layers. From his great bone palace he commands his troops as they wage war across the smoldering and stinking planes of the Abyss. Orcus spends most of his days in his palace, rarely leaving its confines unless he decides to leads his troops into battle (which has happened on more than one occasion). Most of the time though, he is content to let his generals and commanders lead the battles.