Stackability of attack effects

Do any "chance on hit" effects stack, such as Orb of Lightning's Purge and Critical Strike? Or are all Orb effects, Feedback, Critical Strike, Bash, etc. incompatible?

Also for Orb effects, I can get some abilities that target a point (eg Shockwave) to work, but others (Infernal) do not; is there a list of abilities that do and don't work?

Thanks, and sorry if its been answered recently

feedback, critical strike, bash and so on all stack. drunken brawler does not stack with evasion/critical strike

As for the orbs, only 1 orb ability can be used. *I think* that only abilities that can be ordered through abilities to target a unit will work. for example shockwave, stormbolt, shadow strike, faerie fire, but not war stomp, infernal etc won't fire

That's what confuses me. Shockwave targets the ground and works while other spells that target the ground don't proc.

Are there any other unit target abilities (aside from Chain Lightning) which have problems?

Shockwave can target a unit as well, same as Impale.

Orb and arrow effects don't stack. I think critical and bash fit in the same group, but when they don't fire, they don't override other effects.

Use Vex attack detect system and create custom orbs. This alows you to use any kind of custom stack you want, even it has some issues, as you can't use poision weapons and no more standard orb effects.