Final answer:
In D&D, the Path of the Berserker Barbarian gains Mindless Rage at the 6th level, making them immune to charms and fears during their rage.
Step-by-step explanation:
The Barbarian Path that gains Mindless Rage is the Path of the Berserker in the Dungeons & Dragons game, which is often discussed in the context of the Arts for its role in storytelling and character creation. Mindless Rage is a feature that a barbarian gains at the 6th level when they choose this path. It grants them the ability to become immune to being charmed or frightened while raging. Should they be charmed or frightened when they enter their rage, the effects are suspended for the duration of the rage, allowing the barbarian to fight without hindrance from such mental effects.