My conjurors 2 weapon sets are setup as follows: (staff obviously)
Left click - Normal
Right click - VO
Left click - Ternion
Right click - Eruption
The first set is for distance - normal staff attack to target single enemies, with VO to throw into a mob at a distance.
Then when closer, switch to second set, as approaching nail em with ternion, but as soon as you get swarmed, hit eruption, followed by stone form. If enemies still alive after that, summon CD before stone wall expires (there is a moment or two that you are vulvnerable, CD takes the heat whilst you escape to a distance to start another offensive.
My conjurer in legendary has about 3k dps (less than half my assassin) but is great fun to play

I find its more fun without the pets, they get in the way of my awesome strategic kills