Mmmm... I kinda disagree. I always thought of wrath as an angry reaction to some other event - you could think of it as revenge, but revenge is too straightforward in my way of thinking. The phrase "You shall feel my wrath" best describes this I think - wrath is a noun, even if it is an emotion - and as for the "furious"... it's being used as an adjective here right? Your wrath could be quiet, or deceitful, or violent, or furious... just like a storm can be furious or violent.
tl;dr: wrath doesn't indicate furious anger, just anger (of sorts). Furious is being used as an adjective
tl;dr: wrath doesn't indicate furious anger, just anger (of sorts). Furious is being used as an adjective