dragon slayer

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Level 3: Slaying strike

at 3rd level, you can make the most advantageous position. if you make the attack action of your turn and have an advantage on one of the attacks, you can forgo the advantage for that roll to make that strike exceptionally deadly. if the attack hits, it deals extra 1d8 damage of the weapons damage type, and the creature must succeed on a strength saving throw or be knocked prone. the damage increases by 2d8 at level 10. the dvc for the strength saving throw is the total damage dealt, you can use the ability once per round. 

Level 7: Supernatural resilience

starting at 7th level, you have enough experience dealing with dragons and other monsters to be able to withstand their most powerful attacks. when another creature forces you to make a saving throw, you can use this feature to add a d10 on your roll. you can do so after seeing the initial roll, but before any of the roll's effects occur. if you use this feature and then reroll the save using your indomitable class feature, the bonus you rolled also applies to the second roll. one you use this feature, you can't use this feature again until you finish a short rest or long rest.

Level 10: slayers counter

starting at 10th level, when a creature larger than you hits you or misses the melee attack, you can use your reaction to immediately make a melee attack against the creature.

slayer's defense

at 15th level, is the creature attacks you with a weapon attack, you can add +4 to your ac for all subsequent attacks that the creature makes against you until the end of the current turn. this ability can only be used once per turn.

deadly strike

at 18th level, you learn to maximize the effectiveness of your slaying strike. if you hit a creature with slaying strike, you can choose to automatically deal maximum damage. if you do so, the creature gets knocked prone without a saving throw. once you use this ability, you cannot use this ability until you finish a short rest or long rest.