Guardian

You've honed your combat technique to focus the brunt of enemy attacks onto yourself rather than your allies.  You gain the following benefits:

• Increase your Strength or Constitution score by 1, to a maximum of 20.
• When you hit a creature with a melee weapon attack, you can mark that creature until the end of your next turn.  While a marked creature is within 5 feet of you, it has disadvantage on any attack roll that doesn’t target you.  This effect ends early if you are incapacitated or you die, or if someone else marks the creature with a similar effect.