You’re a Demon, you’ve decided to challenge the world, or you’ve been a bad guy so much that you’re no longer allowed to pick any other. Whatever your reasons for being Evil are, you’re now in a high risk situation!
While Evil, you’re free to perform hostile actions against any other player – just like when you’re Neutral. However, other players can also do so against you, without consequences – such as being flagged as Thief or Murderer or losing Karma. In fact, they will gain Karma by getting the world rid of you!
At least, being Evil is not enough to get you fully cast out of society. Guards on Syndesia let you enter towns, for instance, and some NPCs devoted to not-so-legal activities might even take a special interest in you.