At 3rd level, a Barbarian gains the Primal Path feature. The following option, Path of the Cosmos Watcher, is available to a Barbarian, in addition to those offered in official books such as the Player's Handbook.

Path of the Cosmos Watcher

Not all Barbarians become such through ancient traditions or the acts of benevolent - or at least rewarding - deities. For some, the state is thrust upon them. Cosmos Watchers made the mistake of staring into the void, the yawning blackness around their world, and something in that abyss stared back and changed them forever.

Most of the time, the change is manageable. The knowledge that has warped the Cosmos Watcher’s mind is kept, not forgotten, but unthought of in a corner of their mind. Only a few lingering changes from the cosmos pervade always. But sometimes, in the heat of battle, the Barbarian chooses to embrace the intrusion, accepting the eldritch knowledge and wielding it as a weapon against their foes.

Path of the Cosmos Watcher Features Barbarian Level Feature 3rd Cabbalistic Sense, Grip of the Cosmos 6th Uncanny Mind 10th Sudden Apparition 14th Lure of the Void

Cabbalistic Sense When you choose this path at 3rd level, your brush with the void has left you with the ability to perceive unnatural magic around you. You gain the ability to cast the Detect Magic spell, but only as a ritual.

Grip of the Cosmos The forces at play in your mind reach out to your foes, slowing them should they try to flee. Starting at 3rd level, while you’re raging, the first creature you hit in your turn takes an extra 1d6 psychic damage. In addition, their speed is reduced by 10 feet until the start of your next turn. This additional damage increases to 2d6 at 11th level, and 3d6 at 17th level.

Uncanny Mind Exposure to what lays beyond has made your mind dangerous to glimpse, even for an instant. Starting at 6th level, while raging, when you make an Intelligence, Wisdom, or Charisma saving throw, you may immediately deal 2d6 psychic damage to the creature who caused the saving throw, even if you fail. At 11th level, this damage increases to 3d6, and again to 4d6 at 17th level. You may use this ability a number of times equal to your Constitution modifier per long rest.

Sudden Apparition You briefly accept the cosmos, allowing it to move you where you are needed. Starting from 10th level, you may use a bonus action to teleport to an unoccupied space you can see within 30 feet. This feature may only be used once, and you regain the usage of this feature after taking a short or long rest.