thieves in pve
Thieves can’t take much damage so you have to dodge and move a lot to stay alive in melee range with weapon sets like dagger/dagger.
However, I would suggest swapping to sword/pistol and just run up to some enemies, use black powder and stand in it. This will blind all does in the area every second so usually you wont take any damage. Then just use auto attack until black powder runs out and use black powder again. Repeat until everything is dead.
It’s not very exciting but it should work against just about everything apart from foes with the unshakable attribute, where blindness only works 10% of the time on them. Some foes also attack faster than 1 attack per second, so black powder wont cause all of their attacks to miss.