Why does Haunt (Consuming Spirit) Slow?

Why does Haunt (Consuming Spirit) Slow? - Silhouette of Tree during Night Time

I am using Haunt with the Consuming Spirit rune. When I cast this on an enemy, the word "Slowed" appears next to the enemy. Why is this?

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Why does Haunt (Consuming Spirit) Slow? - Scary ghost in dark grove with coniferous trees
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Why does Haunt (Consuming Spirit) Slow? - Why Text on a Pink Surface





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