When you're hit with a melee attack, you can use your reaction to parry the hit with your shield. Roll 1d8 and subtract the number from the creature's roll. If the attack fails to hit, the creature must make a STR save (DC8 + Proficiency Modifier +Strength Modifier) or be knocked prone.

Shields require the Utilize action to Don or Doff. You gain the Armor Class benefit of a Shield only if you have training with it.