NCF – Extended list of Neutral creatures.

Dark Paladins

Level 6
Weekly growth 5
Attack 28
Defense 26
Damage 40-60
Hit Points 180
Speed 6
Initiative 7
Mana 30
Abilities: Armored, Cleave, Magic Resistance Aura, Battle Fury, Smith, Charge Champion, Hew, Demonic, Channel Energy, Frenzied, Blast, Mind Control Immunity, Mana Destroyer.
Spells
Gloom
Vampirism
Shock (Basic)
Fireball (Expert)
Fire Storm (Expert)
Darkness (Basic)
Phantom Creation
Raise Dead
Magic Arrow (Expert)
Description:
Dark Paladins are knights who once nobly served the Griffin Empire. But as the years passed, some wanted to know what the true essence of the evil they fought was. Then they summoned dark forces, and evil ensnared them in a web of dependence. They liked it, and they wanted more. They literally became dependent on dark magic, and Kha-Beleth swore to give them as much as they needed.

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You could take the skin of Nicholas (the Dead Knight), paint his armor black and fiery red, you could make them bigger, give them a cloak (but this might affect the appearance, but it's still worth looking at), and add a burning head of Kha-Beleth (slightly reduced to fit the skin, but if that doesn't work, you could use the face of a Death Knight, but with pale skin, black hair, and red eyes).

Added 3 minutes ago
Or you could do the same with a skin like the Death Knights.

Added 11 minutes ago
Waiting for a response from Psatkha.