Is it possible to limit the range of the lifetaps I´ll take that and balance essence without client control?
For example make it impossible to cast the lifetaps if your defensive target is too far away (what is "too far away" has to be defined... maybe 300 ft) and make a change of defensive target after starting the cast impossible?
I was by now too lazy to check the exact range of the lifetaps, but (I hope

) nobody would seriously deny that the range is ridiculous large. You can heal players in lord room of keeps from pve area through npc lifetapping and you reach every corner in scenarios, when you stand in the middle of the map.