“Over the past months, our team has taken several actions to combat botting in Neverwinter,” the team said. “One aspect that several players have identified as needing to be addressed is that of skill nodes. Based on community feedback, and in our continued effort to take action against botting, we are removing refinement item drops from skill nodes.”
As part of the change, mobs will drop enchantments and runestones more often while skill nodes will now have a chance to spit out insignias for mount upgrades.
Source: Neverwinter