As a bonus action, he will use the feature Hexblade’s Curse Once per short rest, as a bonus action, choose one creature you can see within 30 ft. to curse it for 1 minute (or until the target dies, you die, or you are incapacitated). Against the cursed target, you gain a 4 bonus to damage rolls, score a critical hit on a roll of 19 or 20, and you regain +6 HP if it dies.
Then double attack. With 2 levels in Hexblade Warlock I use my Cha bonus for attacks and damage rolls instead of Str or Dex.