The Pale Rider is the spirit of vengeance, those unjustly wronged may become him, and seek revenge on the living, he has walked the lands for 1000 years and returns again and again, in his last incarnation you helped him be laid to rest after being murdered, but this new incarnation of the Rider is angrier and will act very differently....
When the Rider appears he is heralded by severe storms, and always appears as a blue spirit with a ghost strider, travelling the lands, seeking vengeance.