As an Earth Elemental, you increase your constitution score by 2 and your wisdom score by 1

As an Earth Elemental, your body doesn’t fit armor, and your AC is 11+ your constitution modifier, because your skin is hardened rocks.

As an Earth Elemental, your type is Elemental.

As an Earth Elemental, you cannot use weapons. You have the following attack actions:

Slam: melee attack Roll. Hit: 1d8+ strength modifier.     Flail: ranged attack Roll. Hit: 1d8+ wisdom modifier

To hit: melee= pb+str ranged= pb+wis

As an action, you Can exhale gas in a 15 foot cone: Dex save dc 8+ pb+ con: fail: 1d6 poison damage Per level above 5. Sucess: half damage

this Can be used once Per Long rest

As an Earth Elemental, you gain immunity against poison damage, and a vulnerability against thunder damage

As an Earth Elemental, you Can take an action to grow to large size. This Only functions, if you activate it while fully immersed in Earth 

this Can be used twice Per Long rest, and lasts for 1 minute