Revan appears to be the focus of the operation .
He actually works closely with several Deryni operatives who are covertly blocking the powers of the Deryni subjects before Revan actually touches them , usually Tavis O'Neill or Sylvan O'Sullivan .
Although Revan appears to be the focus of the operation , he actually works closely with several Deryni operatives who are covertly blocking the powers of the Deryni subjects before Revan actually touches them , usually Tavis O'Neill or Sylvan O'Sullivan .