Part bug report, part suggestion.
When specked into the Enemy of my Enemies node in the Dread Shade tree (which lets you cast Dread Shade on enemies instead of your minions), I can’t detect any increase in the area of the buff from extra points in Spectral Presence or Grim Fate.
I’m actually not 100% sure if this is a bug, because Enemy of my Enemies seems to invalidate many other nodes on the tree. It’s strange that the node doesn’t have some clarification text about how it combines with other nodes (for example, Flesh Harvest - I still don’t know if this works with Enemy of my Enemies).