This !
Is it Negate from Borrowed Time or Soldier of Anguish ? Or Negate Magic ?
I guess it is the Negate Healing effect. Could be useful when soloing Banished cells or similar with healing bubbles and low ranged dps. But defile might be better due to the long casting time.
For my Templar it is a funny thing in PvP. This thing works for the enemiesha ha