according to the Horus Heresy, the Word Bearers are something like the arch enemy to the Ultramarines? I wonder if it is reasonable that an Ultramarine has special knowledge and training against this kind of Traitor Marines.
I wondered if it is possible to create something like the Tyranid War Veteran (First Founding) just with the Word Bearers as enemy? Some Talents? A special Deed? Special Abilities?