Vampirism, Stage 2 (Dread Knight Combat Training)

Boon(s):

Dread Knight Combat Training. You become trained in the martial ways of the Dread Knights. As a bonus action, you may enter, exit, or change combat stances. While in a combat stance, you gain the features of that stance.

Offensive. While in this stance, you deal an additional amount of damage with your melee weapon equal to half your proficiency bonus (rounded down).
Defensive. While in this stance, you gain a bonus to your AC equal to half your proficiency bonus (rounded down).
Accuracy. While in this stance, you gain a bonus to hit with your weapon attacks equal to half your proficiency bonus (rounded down). Additionally you may use Dexterity instead of Strength for the attack and damage rolls of any melee weapon with the slashing damage type.

Flaw:
Hideous Appearance. Your appearance has greatly altered from its original features. The first signs were the fangs that started to protrude from your upper row of teeth. You have no reflection in mirrors or other reflective surfaces. With dry, pale skin and occasional burns from the sun, you can hide your true appearance by concentrating on your pre-vampirism appearance. However, the following situations can reveal your true appearance:
• Concentrating on a spell.
• Gaining the unconscious condition.
• Entering hallowed ground.
• Taking damage from being exposed to sunlight or free-flowing water.
• Choosing to reveal your true self. In events of extreme emotional or physical stress, a GM may call for a Constitution saving throw with a DC of their choosing to see if you maintain your humanoid form.