Add these onto the Parent Race
Ability Scores
Str +1
Earth Walk
You can move across difficult terrain made of earth or stone without expending extra movement.
Merge with Stone
You can cast the pass without trace spell once with this trait, requiring no material components, and you regain the ability to cast it this way when you finish a long rest. Constitution is your spellcasting ability for this spell.
Stone Skin
Your stone exterior lends you rock-hard natural armor. Your AC can't be less than 12 + your Constitution modifier, regardless of what kind of armor you are wearing.
Earthbreaker
You know the mold earth cantrip and can have up to three of its non-instantaneous effects active instead of two.
When you reach at 3rd level you may cast the earth tremor spell centered on yourself once with this trait, requiring no material components, and you regain the ability to cast it this way when you finish a long rest.
Constitution is your spellcasting ability for these spells.