things that apply a buff to you or party members, or a debuff to enemies do not stack with themselves, or lesser versions of themselves (flametongue and wrath)

Things that cause an effect (ie no buff or debuff on friendlies or enemies) stack. Drop a totem near an enemy. See a buff on you or a debuff on them, your question is answered. The only exception is grounding, which provides a buff, even tho its actually an effect.