Unholy's talent Unholy Blight applies Virulent Plague in Shadowlands. On top of the application process being somewhat inconsistent (see #673 ), Virulent Plague will act the same way it does when it is triggered by Outbreak, and apply to all enemies in an area hit by the initial tick. This area seems to be edge-to-edge and can easily reach outside the original radius of Unholy Blight, leading to situations where the player hits only a single enemy with Unholy Blight in very close range, but Virulent Plague spreads around to more enemies.
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Reproducible:
Yes.
Howto:
Can be easily reproduced by casting Unholy Blight while standing at very close range of an enemy and at medium range of other enemies. The East-side Reanimated Monstrosity in Acherus the Ebon Hold (Broken Isles version) is perfect for that as seen on screenshot#1 but this can apply in a large variety of situations.
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Description:
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Reproducible:
Howto: