Dragoon

Having learned a way to boost their physical capabilities the Dragoon can leap and bound great distances.

Jump

Your long jump becomes equal to your movement. Your high jump becomes equal to your Strength score. Both of these will increase 10 feet when you gain a dragoon feature. 

You can leap into the air and fall upon your opponents. The damage is your weapon die plus 1d6, additionally you deal 1d6 for each 10 feet you fall.

(I couldn't decide how many times you get to use this feature. I would suggest STR mod/ STR mod+Prof bonus/ Or you could use it similarly to rogue's sneak attack/ The different jumps could be considered spells and have spell slots as well)

To use the Jump Attack you must be using a two-handed weapon.

Piercing Strike

If you attack a creature from at least 20 feet above it the creature loses 1 level of damage reduction.

Invulnerable > Resistance > Normal > Vulnerable 

Devastating Strike

If you attack a creature from 40 feet or higher, your attack will automatically crit.

Taking the High Ground

If you attack a creature from 50 feet or higher it must pass a strength saving throw or be knocked prone.

Meteor Strike

If you use your Jump skill at max height your jump attack becomes an AOE attack. You can choose between 10/20/30 foot radius.