From this thread, the following nodes in Devouring Orb are buffing the damage of ailments the Abyssal Orbs apply despite their descriptive text stating that they are hit damage.
Rift Caller
Devour the Weak
Rotting Prey
Burning Prey
That the following nodes apply their damage bonuses to the Abyssal Orbs when they stat only Void Rifts was added functionality in 0.8.1.
Rift Caller
Abyssal Expanse
Devour the Weak
Soul Eater
probably Voidfire Rift (though I’ve not checked it)
Burning Prey
Dark Moon
Cosmic Impact
Extinction