Barkskin is an ability granted to rangers and druids of appropriate rank.
The druids and rangers who have been granted this ability are able to
call upon the help of the forests which they sworn to protect and defend
to help defend themselves, by turning making their skin hard like the
bark of the trees which they serve.
Having made their skin harder, the druid or ranger will find themselves
naturally better defended from piercing and slashing, along with better
general protection from others.