Hello,   When I use Shadowing beyond + backstab + Flame of Devotion FoD (edit), there is no +100 % in the list of effects.   Not the case for smoke veil for the information.   "invisible" allow clearly this bonus if you are under 2 meters. (Target : ogre pirate = clearly under 2 meters)   Like you see : I have the bonus of assassinate but not the backstab bonus (and it is clearly the same trigger = stealth or invisible)   So, I think it is a bug.