On a black jade altar lay Yasmela

The army of Thugra Khotan has been defeated and has fled the battlefield taking Princess Yasmela with his. CONAN finds them both in an ancient ruin.

On a black jade altar lay Yasmela, her naked body gleaming like ivory in the weird light. Her garments lay strewn on the floor, as if ripped from her in brutal haste.

From "Black Colossus"
Page 132. The Complete Chronicles of CONAN.

I've found a few examples of pale women of dark altars... they were probably all "supple" as well, a few more to follow.

An evil wizard talks tough

Thugra Khotan, in the guise of Natohk, The veiled one.

I will sweep into the lands of my ancient enemies. Their kings shall furnish me skulls for goblets, and their women and children shall be slaves of my slaves' slaves.

From "Black Colossus"
Page 108. The Complete Chronicles of CONAN.

Two words...

GREAT THREAT!