Chain of the Dark Lady

Draconic Hide: Your AC may equal 10 + your Dexterity modifier + your Wisdom modifier, instead of the usual calculation. The Chain's power changes depending on the user's strength and what crystal is slotted:
Red: You have resistance to fire damage, or immunity if you are already. You have a breath weapon attack, a 15-Foot Cone of Fire. Deals Prof-XD6 Damage, or half on a successful Dex Save.