Will this combo work?

[Dr. Electrocutioner]

Thief sneak attack melee using barbarian reckless attack for advantage works, but can it be combined with a multi-target attack like Razor Gale from Larenthian's Wrath?
(Which is a finesse weapon).

https://bg3.wiki/wiki/Larethian%27s_Wrath

[Hobocop]

Should do, since Sneak Attack doesn't care specifically what stat you use to attack, only that it is made with a ranged or finesse weapon.

It should only apply to a single target, though, since Sneak Attack can only activate once per turn.

[Dr. Electrocutioner]

The idea is that Razor Gale is a single attack that hits multiple targets.

I'm trying to solo Tactician and only 4th level right now but my plan for 6th is Berserker 3/ Theif 3 with dual wielding.
The thief gets 2 bonus actions that can both be off hand attacks and the main hand gets bonus sneak attack damage.

Admittedly ludicrous that you can be sneak attacked by a berserker that's all up in your face, but we have to play with the cards we are dealt.

[jonnin]

Originally posted by Dr. Electrocutioner:

The idea is that Razor Gale is a single attack that hits multiple targets.

I'm trying to solo Tactician and only 4th level right now but my plan for 6th is Berserker 3/ Theif 3 with dual wielding.
The thief gets 2 bonus actions that can both be off hand attacks and the main hand gets bonus sneak attack damage.

Admittedly ludicrous that you can be sneak attacked by a berserker that's all up in your face, but we have to play with the cards we are dealt.

Sneak attack and the original 'backstab' concepts are sort of poor descriptions. Think of it as a "sneaky attack or too many attacks at once" instead. The target is distracted or confused for an instant and you use that moment to hit them where it hurts, eg the hole in most armor under the armpit, or with ranged, to take the time to aim carefully so it penetrates instead of being deflected. You are usually fighting 2 at once for the disadvantage, and its not a sneak attack as in you can't see it coming, its a hit that you can't block because 2 people, one in front and one behind you, are trying to stab you and avoiding all the shots is tricky. Its only really a sneak attack if they are unaware, which in game is represented by stealth. Everything else is more of a 'cheap shot'.

[Dr. Electrocutioner]

After further consideration a 1 level dip for fighter will help a lot because of the 2 weapon fighting style. Barbarian 2 fighter 1 theif 3 would do well at level 6 with 2 full damage off hand attacks and an essentially double damage main hand attack per round.

Still trying to completely wrap my head around this for a truly max DPR character:

https://bg3.wiki/wiki/Damage_mechanics#Damage_Riders_treated_as_Damage_Sources_(DRS)