Veil of Darkness

Sylvanas enshrouds an area in fog, inflicting 40 Shadow damage and afflicting enemies within a deathly cloud, absorbing 70 healing and inflicting 1 Shadow damage every half-second.

25% of all healing bypasses this absorb.
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[This effect begins at 5 stacks, and every second attempts to transfer 1 stack to a nearby player within 5 yards.][]