Heroes of the Storm has just been updated with Hero balance changes! Read on for details.
Guardian of Ancient Kings [Trait]
Adjusted functionality: Healing a Hero that is Stunned, Rooted, or Silenced grants them 50 Armor for 3 seconds.
The problem with the Guardian of Ancient Kings is that it becomes meaningless if you pick Divine Protection at level 20. You could make it give 25 additional armor.