As an elemental, you are ageless, neither growing nor waning in ability due to time alone. Some gargoyles spend centuries in near-mindless servitude without the self-awareness to awaken and expand their knowledge or power. Others from the moment of their creation make conscious choices to assert their free will and independence then quickly discover a world of possibilities as adventurers.

 You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

A gargoyle doesn't require air, food, drink, or sleep.  You can finish a long rest in 4 hours if you spend those hours in an inactive, motionless state, during which you retain consciousness. You are immune to poison damage, and the conditions poisoned, petrified and exhaustion.

You can speak, read, and write Common and Terran (a dialect of Primordial).

You may be equipped with a variety of natural weapons including fists, spikes, horns, claws, fangs, possibly even wings or a tail. When you choose to make an unarmed strike, you deal 1d6 + strength modifier bludgeoning, piercing or slashing damage of your choice. You are considered proficient in all of your natural weapons. You can only make one such attack per turn, unless additional attacks are granted by a class feature or feat.

Gargoyles can stand as tall as eight feet, or be as short as two feet, usually with bestial horns, spikes, claws, wings or even a tail. Due to their hollow buoyant makeup, gargoyles typically weigh under 100 pounds.

Your size is Medium or Small (choose when you gain this lineage) and you cannot wear armor unless it is custom built for your body.

The original and most common gargoyles are made of a lightweight, pumice-like stone capable of slightly shifting color and texture. Through a variety of means, this skin can become more resilient. Because of your multiple limbs, spikes, horns, protrusions and bestial body-type, you cannot wear armor unless it is custom-made to accommodate you. Being entirely composed of stone, you have natural armor which grants you an armor class equal to 15 plus your Dexterity modifier.

At 3rd level, and again at 5th level, you can choose one of the following features:

Camouflaged Skin - your stony exterior can subtly shift color and texture to match the appearance of surrounding stones and rocks.

Elemental Acclimation - you have adapted after time spent in an inhospitable environment.

Thickened Skin - Intentional or environmental factors have built a protective layer upon you. 

Your base walking speed is 30 feet regardless of your size. Depending on their upbringing and body shape, gargoyles become adept at multiple forms of movement. Whether from powerful wings, a sleek body or long bestial gait, most gargoyles develop a form of movement at which they excel and prefer above others. At first level select climbing, flying or swimming. Your climbing, flying or swimming speed is equal to your walking speed. At 3rd level, select a second movement type, again equal to your walking speed. At 5th level one of the movement types you know increases by 10 feet (both walking and climbing speeds are increased if either is selected).