SL Bloodlines Wiki

In Bloodlines, Demons are primarily distinguished by their leathery wings, their ability to consume Ichor, and by the fact that they suffer the Demonic Curse.

Each night .25 Therms of Ichor are stolen away from them by the Curse, and if they ever are reduced to zero, they are destroyed. As a result, they are doomed to forever hunt humans, corrupting them to survive.