No, It is quite logical. Arrows are dangerous to living things because they fly far and fast by being light and aerodynamic and then use the energy that shot them by being sharp and pointy to piece organs the victim was using. IMHO any corporeal undead should be highly resistant to arrows and weapons that purely pierce*.kristov said:sling bullet can - but so far I havent found any rule for that purpose yet and am asking for help because of that - seems an obvious flaw in logic.
Note that ghouls don't have DR.kristov said:Are there some rules somewhere for some type of arrow that is effective against undead (like ghouls/skeletons)?
Gah! No, no, nonono. You could attach a hippopotamus to the arrowhead and it would fall no faster. The trouble with a blunt arrowhead is that it is not sleek, and the trouble with a heavier-than-advisable arrowhead is that it takes too much force to accelerate. Your blunt head will slow your arrow down from air resistance, meaning that it will take just as much time to fall to the ground that a sleek arrow would have, but even if it left the bow at the same speed as the sleek arrow it will not cover as much distance in the time before impacting the ground.frankthedm said:An arrow with a head to cause equivalent blunt damage to a sling bullet would have laughable range since the arrowhead would drag the missile downward very fast.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.