Mark of Bahamut (Power Ranger transformation in Tropeia Campaign Setting)

Bahamut has blessed you with his power, granting you the ability to transform into a Power Ranger. As a bonus action, you can "morph" into your ranger form by calling upon a primal force within your soul to coat you as armor. This armor you adorn grants you temporary Hit Points equal to 6 x your charisma modifier. As long as you have these temporary hit points, you are considered to be in your ranger form and have the additional benefits the ranger form grants as long as you are in this form. If your temporary hit points are reduced to 0, you are considered out of ranger form and lose any additional benefits the form gives you. You can only use this feature once per short rest.

While in Ranger Form you have the following benefits:

You have advantage on all Strength and Charisma skill checks.

You are resistant to Slashing, Bludgeoning, and Piercing damage from non-magical attacks.

You deal an additional 1d8 damage of a damage type of your choice (Choose from Fire, Cold, Lightning, Thunder, Acid, Radiant, Necrotic, or Poison) whenever you hit with an Unarmed Strike or a weapon attack.