First of all keep the buff name but make it a blessing (priest/monk/shaman etc) that works against a variety of creatures, say greenskins, undead, demons, and maybe a half dozen more. But make it work like CA does now i.e a player would adjust personal preferences for the creature type and could never have more than one HF buff on at a time.
Second, make the buff less powerful - probably .1 but maybe .05 per point rather than .2 (I'll gladly leave the balancing task to HCS). It would still be useful and certainly would be used by hunters but not be quite so powerful.
Third, the change that allows a single skill reset means you could give a single skill reset to players when you institute the change to HF, presumably for people to either move into or out of HF

