My proposed idea is that in addition to its current effect, Mortal Coil can now be used on friendly targets, healing them for 15% of their maximum health and will trigger a 3 second horrify on the next spell/ melee attack made to them by an enemy target.
This is by no means groundbreaking, but hopefully more mildly interesting to some. I don't think it would be overpowered in PvP and will have its own niche in certain PvE situations.
Thoughts?