Terra Firma

You get your powers from the ground beneath your feet. Whether you were blessed by a dao, born to a dwarven lineage of metalworkers, or simply wandered into the Elemental Plane of Earth on accident, your intrinsic connection to stone gives you peace no matter where you are traveling: from the highest of mountains to the deepest of canyons.

Many aristocrats seek out Terra Firma sorcerers to work in their courts as appraisers of magical gems. There is heated debate in the Terra Firma community about the ethics of mining; while some say that mining produces minerals and allows them to share their gifts with the world, others believe that the destruction of the earth is hypocrisy at its finest.

Stony Fortitude

 Your body becomes encased in a thin layer of earthen crust, giving you new resilience. At 1st level, when you aren't wearing armor, your AC equals 13 + your Constitution modifier.

Harden Their Heart

You have been in contact with an earth elemental or some other such spirit, allowing you to manipulate the earth under your feet. Starting at 1st level, whenever you touch a hostile creature, you can use your bonus action to have them roll a Constitution saving throw against your spell save DC. On a failed save, the creature is petrified until the start of your next turn as the ground rises up to encase them. You may use this ability a number of times equal to your Charisma modifier per long rest.

Opalescence

At 6th level, lustrous gems begin to sprout from the stone enveloping your skin giving you increased arcane resilience. As an action, you can expend 3 sorcery points to temporarily illuminate these gems and gain resistance against the damage of spells cast at a level equal to or below half of your proficiency bonus, rounded up. Any spell resisted in this way has its damage reflected back at the caster.

Radiance of the Arcane

Beginning at 14th level, you can detect and utilize bits of the earthen essence within others. Your Harden Their Heart feature gains a range of 30ft. Whenever you petrify a creature in this way, they still take full damage from any spells you cast. Alternatively, when you cast a spell that does not have a range of Self or Touch, you can choose to cast it as though you were in the location of the petrified creature. You cannot use Metamagic on any spells cast in this way.

Crown Jewel

At 18th level, you gain full mastery over the gemstones ladened on your skin. Whenever you reflect magical damage as a part of your Opalescence feature, you can use any Metamagic that you know as if you had cast the spell yourself. Additionally, spells cast from the point of origin of a petrified creature as a part of your Radiance of the Arcane feature can now be imbued with Metamagic. Lastly, you gain resistance to bludgeoning, piercing, and slashing damage.