Since everyone is giving you examples based on charms, here's my take on it from the fluff and crunch combined together. Because Exalted 2nd edition rarely let the two wander apart.

(Warning: The following is very...stereotypical. Not all of them follow this exactly but most of them are close) Abyssals- take everything you know about solars and then apply it to death and all of its trappings. They're the perfect vampires, the most powerful necromancers. They HAVE to wrap themselves in death and it's trappings otherwise their bosses boss gets extremely pissed and sort of kill everything they have even an inkling of compassion or empathy for. They're every Anne Rice novel and Underworld movie turned up to 11. The bad ones are like bad guy solars with lots of blood and zombies (ironically something the solars can do almost as well). They are perfect black mirrors of the solars, primarily because they truly are just solars flipped. They're the Witch King of Mordor and Dracula in his castle all rolled up into one big ball of sadness, envy and hate.

Why those emotions? Because each and everyone of them should be dead. Every single one. They got a get out of jail free card because one of the 13 most terribad ghosts you've ever heard of saw them on death's door and thought they'd be useful. They got a voice in their head as whatever killed them did the job and that voice promised them a second chance and revenge against all who had hurt, deceived and killed them. All they had to do was agree to give up everything about who they were before their death (including their name and family) and promise to bring similar vengeance and bloodshed on the whole world.

Every single one said yes.

Infernals to come.