I keep reading here and there on the forums that wolvers don't do piercing damage... and that besides the spiked jellies, you hardly ever encounter piercing damage all together.
where does that information come from? From what I can tell, on the wiki it is said that they do piercing damage, and when I'm bit by a wolver, it seems to me like the damage is yellow.
Wolvers used to deal Normal, along with Jellies. Thus, the information might be outdated, or the person saying it is misguided.
Wolvers and Slimes DO deal Pierce, I can guarantee. The only exception would be T1, obviously.
Pierce damage is encountered at the same rate as any other damage type currently, aside perhaps for the omnipresence of elemental in construct form.