Sacrosanct
Legend
Darkness + Devil's Sight + Blink: (for Fey Pact BladeLocks) Cast Darkness on your pact blade, then Blink. On rounds when you Blink away, your Darkness spell goes with you, and it won't interfere with your allies' vision. When you return, the Darkness comes back with you, and you've got Advantage on your attacks.
To piggy back on this, shadow monk/Warlock. darkness, shadow step, and devil's sight is crazy. My PC was dishing out the damage all over the battlefield, which leads me to my other combo:
hex + flurry of blows
Other great combos? A battlemaster fighter using superiority dice to give the paladin an extra smite attack. In one game I was the paladin and did some serious nova damage when you use smite with all your regular attacks, and then get get another on top of it.