The enhancement would be called something on the lines of "Zombie Destroyer" and has 3 ranks
level 2 ranger/arti rank 1: upon a vorpal confirmed as a critical a ranged attack will automatically kill target zombie with a head shot. Or deal 2d20 damage upon a will save of dc 20.
level 6 ranger/arti rank 2 same as rank 1 but raises dc to 30
level 12 ranger/arti rank 3 same as 2 but raised to 40
maybe the dc's of this are a bit high, but i think it'll be cool. You essentially have "guns' persay, and in a zombie scneraio the "shoot em in the head" tactic should work with a bow/xbow. This will also help mainly due to the shotty damage bows/xbows do to zombie cuz of the piercing damage. Just ran through deleras on my newly tr'd arti, and i did more piking cuz i was doing 0's in damage (everything else thats living just gets obliterated in 1-3 rounds of burst shots) but when it comes to the realm of the living dead, i do jack squat. Now this doesnt help with skellys/incorporal, it should affect ghast, ghouls, and wights cuz they are zombie ish. I think people who enjoy a good zombie movie and rl zombie scenario would like this with the whole "shoot em in the head" idea. And it would make us less useless in those maps where we do very minimal damage or yellow damage to zombies, also cuz of the fact that we see zombies throughout many levels from 1-25