The absence of feats that support specific archetypes has always seemed like a major omission frin Fifth Edition. So, located here is the fist set of feats I've designed to address this, for your homebrewing please.

Prerequisites: Level 8, Barbarian, Path of the Ancestral Guardian

Prerequisites: Level 8, Barbarian, Path of the Battlerager

Prerequisites: Level 8, Barbarian, Path of the Zealot.

Prerequisites: Level 8, Barbarian, Path of the Storm Herald

Anathema and Deities

Declaring a creature anathema is a significant and monumental action. It is, without question, declaring them an enemy of your religion and deity and vowing to kill them. It is typically done in response to an action that goes against the very foundation of your religion and everything your deity stands for. As such, in settings where deities have an active role in the world, this is an action that tends to draw their attention.

A given deity may or may not agree with your assessment that the creature, and if they disagree they may refuse your declaration outright. This usually happens when such a declaration is made against someone who hasn't committed a heinous enough act to warrant being branded anathema. The qualities and actions that are grounds for anathema are subject to each deity. For exmaple, Bahamut may only approve a declaration if the target is a worshipper of Tiamat or has committed an unforgivably evil act in your sight.

If you successfully declare someone anathema, this has major repercussions for both you and your target. The target is declared an enemy of your religion, and this is communicated by your deity to anyone that could help you locate and kill your target. However, you are expected to fulfill your vow, and attempting to rescind it or refuse it is nearly as unforgivable as the actions that allow it.

In settings where gods are not active or non-existent, declaring anathema is a personal declaration of intent, and has no further repercussions.