Heck, lets go all out!
If everything stays like it did in Early Access THIS is an attack turn with Thief Rogue 4 / Monk 8 with a simple +1 Shortsword,18 DEX and Haste potion.
1d6+5+2d6 1st Attack + Sneak Attack
1d6+5 Extra Attack
1d6+5 Haste Attack
2d4+8 Bonus Action Flurry of Blows
2d4+8 Bonus Action Flurry of Blows
If everything hits thats around 58-59 damage in a single turn, and you can do this 3 turns in a row.
Perfectly balanced, as all things should be - right?
Gloomstalker fighter can get 6 attacks first round at level 7 without haste haste makes it what 7?
And in the +10 dmg -5 sharpshooter feat
You are getting 7(10+1d8+dex)
Fighter 2 / Thief Rogue 4 / Gloomstalker Ranger 6 with Hand Crossbow, Crosbow Expert feat, 18 DEX and Haste potion.
Bonus Action Hunters Mark
Attack + Extra Attack + Haste Attack + Dread Ambusher Attack + Crosbow Expert Bonus Action Attack
Action Surge
Attack + Extra Attack + Dread Ambusher Attack
5x(2d6+4)+1d8
3x(2d6+4)+1d8
If Sneak Attack add another 2d6
104 Damage
But since there appears to be no loading penalty we can go with a Heavy Crossbow and Sharpshooter.
Bonus Action Hunters Mark
Attack + Extra Attack + Haste Attack + Dread Ambusher Attack
Action Surge
Attack + Extra Attack + Dread Ambusher Attack
7x(1d10+1d6+14)+2d8+2d6
I think that's 177 damage.
