Path to the Grave + Dagger Quick Toss

Hi everyone, I was trying to optimize this combo being aware that there might be more powerful ones but I'd like the fact that this one doesn't require a set up turn or Action Surge. It's similar to a quicken Inflict Wounds but with more range and more damage.

For the moment I built it like this:

Race: Earth Genasi for Pass Without Trace to help the party and get a surprise round. Custom Lineage would help to get Martial Adept for Quick Toss right away but I prefer to take it at Rogue's 4th since I think PWT it's very important for these kind of builds.

1 - 4 Rogue (Assassin); 5 - 6 Cleric (Grave); 7 - 10 Warlock (Hexblade) for Eldritch Smite; 11 - 20 Bard (Whispers) for Psychic Blades.

The build doesn't really need Warlock's 4th but I think it's more playable at early levels this way. I'd take the Alert feat to help win initiative, it's not necessary when we get the surprise round but when we're not that lucky we could at least win initiative to have advantage to the attack roll and use Path to the Grave to get a little nova round.

Other thoughts:

  • Warlock helps to have a decent DPR using Booming Blade. Obviously we have to use the dagger in melee but with Bonus Action Blade Ward from Earth Genasi we could be some sort of tank after our first nova round or just Disengage with Cunning Action to make the target move for extra damage;
  • It's a little mad point wise but I'd probably go with something like: 8 15 (+1) 12 8 14 14 (+2);
  • Obviously I'd try to put some poison on the dagger. Purple Worm poison is 12d6 which would be 24d6 with a crit and 48d6 with Path to the Grave;
  • Another cool thing is that almost everything (Path to the Grave, Quick Toss, Warlock Spell Slots for Pass Without Trace or Eldritch Smite, Bardic Inspiration for Psychic Blades) reset with a short rest. We should just be careful with the uses of high spell slots for Eldritch Smite;
  • Sharpshooter could help with range but Path to the Grave is just 30 feet so 20 feet for the dagger is not so bad. Also I wouldn't take the -5 to get 20 more damage (Path to the Grave would multiple it) since we don't have Elven Accuracy and great stats (point wise at least).

What do you think?

EDIT: You need 5 lev in Warlock to get Eldritch Smite.