Does this level 10 multiclass combo work?

Question

I crafted a level 10 multiclass ranged oneshot character that has a lot of interactions and I was wondering if I did this right.

The race is not specified but should be something with +1 to dex for a total of 16 dex.

• A longbow: 1d8 + 3 (Dex)
• 3 levels in ranger with the Gloom Stalker archetype, for the Dread Ambusher trait and the Archery fighting style:

Dread Ambusher hit = 1d8 + 3 (longbow) + 1d8 + 3 (Dread Ambusher hit) + 1d8 (Dread Ambusher extra damage).

This has a +9 to hit: 3 (Dex) + 4 (prof. bonus) + 2 (Archery)

• 2 levels in fighter, for the Action Surge feature and the Close Quarters Shooter fighting style (from Unearthed Arcana: Light, Dark, Underdark!).

That means 2 Dread Ambusher hits and an extra +1 to hit.

• 4 levels in rogue (with the Assassin archetype), for the Sneak Attack and Assassinate features, and an ASI.
  ASI increases Dex score to 18, for a +4 mod.

The Dread Ambusher hit then becomes: 1d8 + 4 (longbow) + 1d8 + 4 (Dread Ambusher hit) + 1d8 (Dread Ambusher extra damage).

Then add the Sneak Attack damage (2d6) and possible crit on surprise.

• 1 level in cleric with the Zeal Domain (from Plane Shift: Amonkhet), for the Priest of Zeal trait, which gives an extra weapon attack as a bonus action when the Attack action is used.

Then the total comes to:

(1d8 + 4 + 1d8 + 4 + 1d8) * 2 + 2d8 + 1d8 + 4 with possible crit if they are surprised.

This takes 3 attack rolls with a +11 to hit, with possible advantage if I'm first: 4 (Dex) + 4 (prof. bonus) + 3 (from 2 fighting styles).

Do all of these interactions work, or am I overlooking something?

Answer 1

Your build works

I will start by saying that there is nothing specifically stopping this multi-class combination. You need 13 DEX for the Rogue/Fighter/Ranger combo, and 13 WIS for Cleric, but that isn't too tricky.

So:

First shot: 1d8 + 3

Dread Ambusher: 1d8 + 3 + 1d8

Sneak Attack: 2d6

Second attack: 1d8 + 3

Total: 4d8 + 2d6 + 12

Add in Action Surge:

First shot: 1d8 + 3

Dread Ambusher: 1d8 + 3 + 1d8

Total: 3d8 + 6

As you know you don't get Sneak Attack more than once a turn, but at the cost of your reaction you could ready your second action (from Action Surge) to attack with the trigger "as soon as anyone moves", and you will qualify for Sneak Attack on someone else's turn. You don't have a much better use of your reaction.

Also the second attack from the Zeal domain is a limited resource use of the bonus action. So not only will you only get a few uses a day, but it is removing your ability to hide, so you may lose out on Sneak Attack opportunities.

Note: What you are looking at only works on the first round of a combat, and only once per short rest, so more generally your damage is just 2d8 + 2d6 + 6. You can probably do better damage with less multi-classing.