Here are some badass name options for a "godly shadow man," categorized for different stylistic preferences:

Emphasizing Godly Power:

• Oberon Nightshade: Combines a regal, mythical name with a dark, evocative surname.
• Erebus Rex: Erebus, the primordial god of darkness, paired with Rex (king) for a powerful title.
• Thanatos Umbra: Thanatos, the personification of death, combined with Umbra (shadow) for a chilling effect.
• Zephyr's Wraith: A more ethereal name, suggesting a powerful, ghostly presence.
• Malak'hel: A strong, invented name with a dark, angelic feel.

Emphasizing Shadowy Nature:

• Nightshade: Simple, yet evocative of darkness and mystery.
• Silas Shadowwalker: A classic name with a descriptive, ominous title.
• Shade: Short, punchy, and directly related to the character's nature.
• Umbralis: Latin-derived, suggesting a being of shadow.
• Nocturne: Evokes the night and a sense of hidden power.

Emphasizing Mysteriousness:

• The Obsidian King: A title that hints at immense power and an enigmatic nature.
• Lord of the Ebon Veil: A more descriptive title, suggesting a hidden, powerful figure.
• The Silent One: Simple, yet effective in conveying mystery and power.
• The Shadowbinder: Suggests control over shadows and a mysterious ability.
• Xalzar: A strong, invented name that sounds both powerful and mysterious.

Combining Aspects:

• Erebus Nightshade: Combines the power of Erebus with the darkness of Nightshade.
• Malak'hel Shadowwalker: Blends a powerful invented name with a descriptive title.
• Oberon Umbra: Combines a regal name with a word directly related to shadows.

The best choice will depend on the specific context and desired tone. Consider the overall story or setting when making your final selection.