race features:
Crystal Shell: Your body is covered in layer of crystal at the weak points parts of your body, you gain a plus 1 to AC with or without armour.
Crystalline Spray: At 5th level, ass an action, you are able to magically shoot sprays shards of crystal in a 15-foot cone. Each target in that area takes 7d4 piercing damage, or half damage with a succeeded Dexterity saving throw. (DC = 5 + Proficiency Modifier + Dexterity Modifier). You are able to do this up to your Consitution modifier per long rest.