Level 3
Intimidating Glare.
When a Taunted creature starts its turn adjacent to you, it must make a WILL save (DC 10+KEY) or be Frightened of you for 1 round.
Vengeful Strike.
When you Interpose, you can make an attack against the attacker instead of taking the damage.
Level 7
Nemesis.
When you roll initiative, choose one target to be your nemesis. Your nemesis is always Taunted by you, and you ignore Disadvantage on attacks you make against them. When your nemesis dies, another enemy of your choice becomes your nemesis.
Level 11
Bitter Retaliation.
When you hit with Vengeful Strike, you can spend Unstoppable charges to deal an extra d20 damage per charge spent. You roll an extra d20 if the triggering creature is your nemesis.
Level 15
Weak Points.
(1/Round) As a Reaction, spend an Unstoppable charge to double the damage dealt by you or an ally to a Vulnerable or Frightened creature.