Illusion and Orb stacking

[DiFm]

I searched but could not find what i wanted.

Orbs stacking with orbs and stacking with illusions.

First How about Aura's Auras always stack if they have different buff?

and how will they stack then? lets say you have 2 vampiric auras with 50% life leach.

Now if you have 2 abilities based on Orb of lightning with different effects those don't stack right.

And why does Envenomed spears stack? and does it stack with other slow abilities or with itself?

Now how about Illusions.

They do not get the beneficial from Bonus damage right.
But about auras how about those.
Vampiric aura
Endurance aura
Devotion aura
unholy aura

orb effects

Slow (stacking)
Slow (non stack)
Critical
Feedback
Orb of lightning
Bash
Evade
Life leach (non aura)
Splash
Cleaving

what happens with these on illusions

 

[jig7c]

you can change the settings around in the gameplay constants for illusions bestowe buffs? yes or no

i think they might only stack if the base order id for that ability is different, <--- need verification