One-Shotter

You're an expert at destroying your enemy in one blow, sacrificing some of your resistance in order to deal massive damage. This manifests as the following benefits:

• Your Strength Score increases by 2, but your Constitution Score is reduced by 1.
• You have advantage on attack rolls against creatures that are your size or smaller. 
• If you land a critical hit against a creature with more hit points than you do, you roll triple the damage die, instead of double. 
• Melee Weapon Attacks that you make ignore damage immunities.