Do features like Divine Smite and Superiority Dice stack on the same weapon attack? If I hit with a melee weapon attack, can I expend a superiority die to do a Distracting Strike and at the same time expend a spell slot to do a Divine Smite on the same attack?
Yes, as long as they do not require you to double up on using an action or bonus action— Mike Mearls (@mikemearls) November 23, 2017
By double up, do you mean each component (Divine Smite or Superiority Dice) using an action on their own? Yes – for instance, if two require bonus actions you can use only one
— Mike Mearls (@mikemearls) November 23, 2017