Final answer:
Barbarians in Pathfinder can gain Spirit Walker through the Superstition rage power chain, allowing them to enter the Ethereal Plane temporarily for scouting or escape purposes.
Step-by-step explanation:
In the tabletop role-playing game Dungeons & Dragons, particularly within the Pathfinder role-playing system, barbarians can gain the ability called Spirit Walker through the Superstition rage power chain. Spirit Walker grants the barbarian the ability to enter the Ethereal Plane for a short period of time. This can be incredibly useful for bypassing obstacles, escaping from foes, or scouting ahead without being seen. While in the Ethereal Plane, the barbarian is not perceptible to those in the material world, except by special means, and they can move through objects and creatures. However, they cannot affect the material world while ethereal and must be careful to return to a space that can accommodate their physical form to avoid serious consequences.