Life Siphon Stacking?
I believe well ticks also siphon, so a well has potentially 3 life steals tied to it. (From what I last recall, might not be 100% accurate).
Yes, all life siphoning “stacks” or, rather, all sources of life siphoning process independently from each other; the processing of one does not negate the processing of another. If the trait’s conditions are met (i.e. you make a direct damage hit on an opponent, you make a direct damage critical hit on an opponent, and/or your minions make a direct damage hit on an opponent), you will life siphon.
Just don’t think of it as stacking, if the conditions are met it will siphon.
Of course they stack. And also the siphon from minions stack as well. It’s the core of the build I posted a few days ago, I also shot a video to demostrate the Vampiric side of our life.
I thought it would stack, but better safe than sorry, etc.