FANGO said:I find it interesting that nobody has yet made a comment about the fact that DR is bypassed by enhancement bonus, and adamantine has an enhancement bonus, and instead they've decided to argue with irrelevant side points rather than actually disputing the blatantly obvious fact that adamantine bypasses DR because it gives an enhancement bonus, and DR is bypassed by an enhancement bonus.
Not quite. From the DMG, p.242: "Weapons fashioned from adamantine have a natural enhancement bonus to attack and damage".
Adamantine provides a _natural_ enhancement bonus. The controversy is about whether this constitutes a separate bonus category to "enhancement", or is simply a clarification on the origin of the bonus ("natural" as opposed to "magical").
I lean toward the former. If nothing else, it's always been traditional in D&D that creatures requiring "+X" weapons to hit require _magical_ weapons. Adamantine has never been able to let you get past this defense.