About Stacking Buffs
In DotA 1 there were a set of abilities called Buff Placers that don't exist anymore. Basically, because of an engine limitation, attacks could only apply one debuff to a target at a time, so things like slows/DoTs that would follow attacks would override each other. Source doesn't have that limitation, so things like Poison Sting that weren't UAMs but were Buff Placers now stack with things like Orb of Venom.
However, don't mention that they stack. Assume that all abilities stack with all other abilities except themselves, and only provide exceptions, such as if they're a Unique Attack Modifier, if they don't stack with other abilities for some other reason, or they're a stacking ability like Deathlust. --21:28, 5 July 2012 (UTC)