The 13th Age of Waterdeep
House Dlardrageth was originally a sun elf house of Cormanthor and a proud and powerful family in ancient Arcorar until they chose to give themselves to demons, courting incubi and succubi, in an attempt to strengthen their line to gain the power necessary to seize the throne and rebuild the ruin of Aryvandaar. They were discovered by the Coronal and their house were destroyed, most of the members being imprisoned magically inside Arcorar’s keep, but some escaped to ancient Siluvanede, where they turned some other houses to evil. The emblem of the House is a dracophoenix. Their numbers, amongst others, constitute the daemonfey. The Dlardrageth tower near Myth Drannor has long since been abandoned.
Your family is the most important thing.
Corrupt those in power.
Look for opportunities to expand the family.
Never ever trust an elf.