Also OP walking behind a mob doesnt give you advantage it gives you flanking rules. Flanking and Advantage stack.
Jaz
You're not correct.
Here is an attack with just backstab: (91% to hit)
![[Linked Image]](https://i.paste.pics/AGKPM.png)
Here is an attack with backstab + invoke duplicity: (91% to hit)
![[Linked Image]](https://i.paste.pics/AGKQ2.png)
They do NOT stack. Backstab just gives advantage. "Flanking Rules" are not a thing in BG3