som 16+4 bow, full som gear with total +32 int with GDF and i can almost 2 hit bandits (not archers, those i can 1hit)
if your full int, like my guildm8, you need only +3 int on 6 or 7/11 items (6 gear, 4 jewlery, 1 wep) and GDF and your good to go for 1 hitting bandit archers