These Dark Skies (vampire diaries/charmed/greek myth)

Charmed Season 6/Vampire Diaries season 2

The titans were released by a demon for unknown reasons, but the three titans killed that demon. After that many of the elders were killed in cold blood by these Ancient Gods. This prompted Leo to release the God's power onto the Charmed ones. Something else happened though, not the power, but the God's themselves were released. The many Olympians easily overpowered the Titans and destroyed them forever. Now they're scattered across the world trying to figure out this new culture and world. Hades took over the underworld easily prompting the demons there to either scatter or be forced to serve him.

While they have their power as God's they are once again mortal able to be killed by a death blow to the head or heart. They are working on a way to create a new Ambrosia. The nectar requires three things to be made, wine from Dionysus which they have, The blood of a Doppleganger, the blood of an original vampire, and their own blood. In order to free themselves from Hades the demons have been the first to enter Mystic Falls to get rid of either the dopplegangers or the Originals themselves. Many others who served the Elders have begun siding with the gods wanting the world in their hands once again.