The Dark Angels were the I Legion of the twenty original Space Marine Legions. Their Primarch is Lion El'Jonson. Though they claim complete allegiance and service to the Emperor of Mankind, their actions and secret goals at times seem at odds with that professed loyalty, as the Dark Angels strive above all other things to atone for an ancient crime of betrayal committed over 10,000 standard years ago during the Horus Heresy, when some of their brethren were turned to the side of Chaos. 

These traitors are known to those few Dark Angels granted knowledge of their existence as the "Fallen Angels" or just "The Fallen." In the eyes of the Chapter's leaders, there is only one way that the Chapter can ever atone for its shame, restoring its honour and trust in the eyes of the Emperor -- all of the Fallen must be found and either made to repent their ancient sin, or slain. 

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