A rhino of the XVII Legion. I've always thought that the Word Bearers were the most blatantly satanic of the traitor legions. I mean, they're all twisted... but the Sons of Lorgar operate on an entirely different level.
An obligatory book of Evil. The Word Bearers are preachers first, warriors second. They would never dream of going into battle without bringing a few unholy tomes along with them. Only thus can the Gods be glorified.
If you don't hate imperials enough to make a trophy out of their flayed carcasses... you don't hate them enough to be a Word Bearer.