Sword and Board (asteria)

While you are wielding a one-handed weapon and a shield, you gain a +1 bonus to AC.

When you hit a creature with a melee weapon attack, you can use your bonus action to make a Shield Bash. The target must succeed on a Strength saving throw against a DC equal to 8 + your proficiency bonus + your Strength or Dexterity modifier. On a failed save, you either push the target 5 feet or knock it prone.

If you hit with any melee attack while holding a shield, you gain a +2 bonus to AC against the next attack made against you before the start of your next turn.

When a creature misses you with a melee attack, you can use your reaction to make one weapon attack against that creature. You can use this reaction a number of times equal to your proficiency bonus per long rest.