When I use Spectral Grasp on partially obstructed targets. standing behind small rocks or other obsticles, or lower terrain, when I hit with the skill, but the target cant be moved. In such situation the effect actually pulls me toward the target or pull us both to eachother. The result is always bad for me... I send few bug reports and hope they will look into it.
I don't know if this was already suggested, but it would be great to have different weather. Especially Fog. Where the max view range of a player is decreased to 20%. Or it may vary. Will add a lot of fun and will help people to move around and hide. Also it should decrease the aggro range of NPCs.
Rain can add 5% slow movement to all players in the area.
Storm - dealing random electrical damage.
etc.
Anyway, even without any enviromental effects it still will be very interesting and fun.