Martial Archetype Stone Dragon Style

This particular style of martial combat has given these fighters the ability to access the strength and power of the earth beneath their feet. Swinging their weapons with the force of an avalanche and standing tall with the strength of a mighty mountain that has stood for thousands of years. In the area they would call home (be it high on a mountain, deep in a forest, or even beneath the ocean) those who weave ley lines, call upon avalanches, strike the ground hard enough to level all before you. Be it through one means or another, you have a powerful connections to the land itself. 

Stonefoot Stance

Starting when you choose this tradition at 3rd level, you learn to focus your weight and shift your stance to harness the resilience of the earth. You may use a bonus action to enter or exit the stance on your turn.

When you are in Stonefoot Stance gain the following affects:

• You can add your strength or constitution modifier to your AC
• You gain advantage on all Strength and Constitution saving throws and checks as long as you're in the stance.
• You gain a tremor sense up to 60ft (If you already have tremorsense this increases it by 30ft)
• You ignore difficult terrain made of earth or stone.
• Your movement speed is reduced by 10ft.

Mountain Hammer

As an action on your turn, you can make a single powerful strike against a creature. Instead of rolling to attack as normal, you force the target of your attack to make a dexterity or strength (Whichever you use for the attack DC) saving throw against a save DC of 10+ your strength or dexterity modifier+your proficiency bonus and be hit by your strike on a failed save taking 2d10 force damage on top of your weapon's normal damage damage.

This damage increases to 4d10 at 10th level and 8d10 at 15th level and 12d10 at 18th level.

You can do this once 

Boulder Toss

At 10th level you are able to launch large stones from the earth using your action. Any creatures who are hit by the boulder has to make a strength or dexterity saving throw of 10+your proficiency bonus + your strength or dexterity modifier to dodge the rock or take 4d10+Strength or Dexterity bludgeoning damage. The kind of saving throw is the same as the modifier used in the attack roll.

Earthstrike Fissure

When you reach 15th level, you are able to strike the earth sending out fissures along the ground and toppling your enemies. Whenever you take the attack action, you can instead strike the ground forcing all creatures within 30 feet of you to make a DC 10+your proficiency bonus + your strength or dexterity modifier dexterity save, on a failed save takes Targets takes 2d10 bludgeoning damage (half on a sucess) and is knocked prone.

Rise of the Great Stone Dragon