Fabius has ammassed an impressive fortune over the years by involving himself first with the Mob and later with the occult, becoming the leader of a satanic cult which entertained "guests of the highest stature". As a result of his affiliation with both the crime world and the occult, his son Charles becomes senator. However, his other son Tom only manages to become a womaniser and domestic porn producer, which Fabius considers an insult to the family name. As a consequence, he refuses to attend Tom's funeral after he apparently commits suicide.
He dosen't seem to be very content with Charles either, who is aware of his father's past mob connection and is not happy about it, given his ending term in the senate and incoming elections.
Given his satanical affiliation, Fabius is averse to anything having to do with Christianity and is enraged when Lagel and Dicosimo attempt to offer religious assistance to the family.
Presumably dissapointed with his two sons, Fabius considers Lucius as the only chance for the Wagner name to carry on its tradition of influence and power and lead his satanic cult to "the way". Therefore, he agrees to a pact with Lucifer, in which he allows him to "take his due" from the bloodline of the Wagner family. Fabius believes that this means offering the soul of Lucius as a token of his allegiance. However, as no deal with the Devil comes out in the mortal's favor, Lucifer has a totally different view of "due from the bloodline", which means reaping the souls of the entire Wagner estate, including staff, visitors and Fabius himself.