Dota – Does Sven’s ult stack with double damage

Orb effects in Dota 2 are called Unique Attack Modifiers - items that have attack modifiers are noted in the individual item descriptions, and they do not stack. That being said, you can still make use of multiple orb effects if you wish (although it is not recommended since they don't stack).

For example, if two attack modifiers are activated by chance, during any given attack one modifier or the other could activate.

The one exception to the above is in the case of ranged heroes using Eye of Skadi and Lifesteal. As it was in Dota 1, Skadi's slow and lifesteal will both stack.

Nature's Prophet's ultimate begins bouncing with the nearest visible non-allied unit (it also hits neutrals) to where you targeted. It then bounces to the closest such unit and repeats until there are either no more un-hit units or no more bounces.

Obviously, the later bounces deal extra damage and so you want to manipulate the ultimate so that whatever hero you're trying to gank or lane you're trying to push takes as late of a bounce as possible. This is actually hard to intuitively do: when a teamfight starts that you're in the middle of you're almost always better off casting the ultimate far away from you using the minimap.