Rage

You go into a fit of rage, attacking with relentless fury. While you are raging, you gain +1 on all damage rolls (only once per move), have resistance to normal damage, and have advantage on all Strength checks. Your rage ends if you drop concentration or if your turn ends and you have not attacked a hostile target since your last turn, or taken any damage since then.

At Higher Levels: For damage when raging, the bonus changes to +2 at level 5, +4 at level 10, and +6 at level 17.