Mail of Pain
+1200 Max HP
15% of the physical damage taken is deflected to the enemy as magic damage (calculation is based on damage before damage reduction).
In spite of fine passive defensive stats, this item is not suitable for most tanks. Because of its passive several heroes can use it most effectively. Arthur, Superman, Skud, Mina, Taara, Maloch, Max, Omen, Arduin are the ones benefitting the most.
Note that the item is suitable only if the enemy team has a lot of physical damage.