Ares looked around the posh apartment, intricately decorated in expensive furniture, high tech electronic crap from the Sharper Image, and utterly useless art no mortal, yet alone demon needed. He hated to admit it but the old Source had chosen a prime location for the base of his operations, a penthouse atop a hill in San Francisco. The things he could do with this place once he was done using Belthazor. It was perfect to sell to some new operatives, then later blow up it up attempt to turn them against the current consumer based, vanity-worshipping society.
He heard a tune coming from somewhere, Cole's pocket. He quickly pulled his sword out of the now unconscious demons' neck and waved his fingers answering the phone with a sinister a sinister hello, using Cole's voice.
"What did you do to him?" Phoebe asked, in an accusatory tone.
There was something very appealing about that particular Charmed One. He always thought Prue would make the best companion, but after last night's date with Phoebe, he had begun to reconsider things. She certainly had good warrior instincts, along with some other skills he liked in his women.
"Phoebe, you know I'm the only man for you," he responded. Phoebe promptly hung up.
What was he not the least bit that the Charmed one didn't suspect anything? This was going to be good, even better than the time he talked Hercules out of his powers, by setting him up with the last of the golden hinds.
He seriously doubted that anyone would be able to tell the difference between demonic powers and olympian powers. The elders would assume that Cole had just given into his true nature.
The relationship between the now eldest Charmed one and the Whitelighter was a perfect diversion; they were not likely to notice anything. His first order of business was to take oldest Elder, the one who had proposed searching the Elysian fields for the spirit of Xena. Afterwards taking out the rest of them would be easy, perhaps he might even have another chance to bring back his grandparents, the Titans.
As for the Avatars, another group of omnipotent beings, he had word that they would be coming around shortly to assimilate Belthazor, there was no better way to infiltrate them than tricking them into accepting someone they think is someone else. After their power structure was compromised, they could be easily brought down.
Now what to do with Belthazor? He had heard interesting things about the guy from whom his club's branch in Miami had been collecting soap making supplies. A loser plastic surgeon, who had fascinating alter ego, an alter ego in need of personification? Perhaps it was time to track this guy down, and see what could be done. A constant supplier would be very useful; there was nothing better for making soap with than the pure fat of humans.
But before doing that, he needed to speak to Barbus about stealing powers that weren't his own.
The End: This is my version of what happened to Cole on Charmed, sorry to those whom are bothered by the ending...