Belthazor

Belthazor was a powerful upper-level demon. Actually being half-demon and half-human, when in human form he went by Cole Turner.

Belthazor is a demon, he had killed countless witches and innocents before Belthazors human half fell in love with Phoebe Halliwell. He later battled Sykes who had copied his demonic form and was killing witches. He lost control of himself and was vanquished as Belthazor but survived as Cole and became a innocent. He later returns when Cole changes reality to be with Phoebe but never changed into his demonic form.

Appendicies
BELTHAZOR Beware of this Demonic Soldier of Fortune. Both powerful and dangerous, he has destroyed countless witches, innocents, and demons. As sinister as he is intelligent, he is not to be trusted, Belthazor's known abilities include throwing energy balls and shimmering from place to place, but his powers are probably not limited to these capabilities. Because there is no known way to defeat him, Belthazor should be avoided at all costs.

To Summon Belthazor
''Magic forces black and white Reaching out through space and light Be he far or be he near Bring us the demon belthazor here''