This question is about the Supernatural Fury feature of the Path of the Sacred Kin barbarian subclass from Xanathar's Lost Notes to Everything Else (a third-party product by the DMs Guild Adepts).
The Supernatural Fury feature states:
At 3rd level, you can focus on the magic in your
blood, allowing you to concentrate your rage into the ancient magic of
your bloodline and enter a Supernatural Fury. You gain the ability to
cast and concentrate on spells, even while raging, at the expense of
your physical resistances.
When you enter your Supernatural Fury and you aren’t wearing heavy
armor, the following benefits replace the benefits of the Rage
- You gain a bonus to your AC equal to your Strength modifier (minimum of +1).
- You have advantage on Constitution checks and saving throws made to maintain concentration on a spell.
- You have resistance to magical damage and are immune to the damage type you chose from your Ancestral Origin.
Your Supernatural Fury lasts for 1 minute. It ends early if you're
knocked unconscious or if your turn ends and you haven’t attacked a
hostile creature, cast a spell, or taken damage since your last turn.
You can end your Supernatural Fury on your turn as a bonus action.
Does this mean the Sacred Kin barbarian can choose between entering a "regular" rage and a Supernatural Fury? Or can he (from Level 3 on) only gain the benefits from Supernatural Fury, because it completely replaces the "old" rage he used on Level 1 and 2?