Specialist with the Greatsword

Heavy Strike

At 3rd level, When you hit a creature with a greatsword you deal an extra 1d6 slashing damage. The creature must make a Constitution saving throw or it's speed is reduced by 10 ft until the end of its next turn.

Stalwart Dodge

At 3rd level, after you make the Dodge action and an attack has been made against you gain +1 AC until the start of your next turn.

This becomes +2 AC at level 10.

Guarded Tackle

At 7th level, When you take the Dodge action you gain temporary hit points equal to your level + you Constitution modifier.

When you take the Dodge action you can move 5ft.

Greatsword Expert

At 10th level

Gain expertise with greatswords.

You gain a +2 bonus to attack rolls made with greatswords.

Critical hits with greatswords deal an additional 1d10 dmg.

Unleash Power

At 15th level, Once per long rest, you can perform a powerful charged attack in a 15-foot cone. Each creature in that area must make a Dexterity saving throw (DC = 8 + your proficiency bonus + your Strength or Dexterity modifier) or take 4d10 slashing damage and be knocked prone. On a success, they take half damage and aren’t knocked prone.

Final Blow

At 18th level, Once per turn, when you hit a creature with a greatsword, you can expend one hit die to deal an additional 2d12 slashing damage. If this damage reduces the target to 0 hit points, you can immediately make another melee attack against a different creature within range.