The unrelenting attrition modifier for blood for blood is my favourite one to use due to it making the effect follow my character (or an enemy), but it would be great if there was a way for it to not cast on enemies and always follow my character. My suggestion is to change the unrelenting attrition modifier so that it applies only to following enemies, and add a new modifier (or change one) that makes blood for blood always self-target and follow the character.