Hardened Shield

Hardened Shield is a generic level 20 Talent, that can be activated to provide 75 Armor for 4 seconds. It used to be very common on Tanks and Bruisers, but has been slowly replaced by flavor Talents or removed completely.

Mechanics
Hardened Shield is an Active Ability that grants its used 75 Armor. Hardened Shield has no cast time.

Like other Armor effects, it does not stack with other Armor effects and has no effect on Percent Damage whatsoever.

Base Version

 * Muradin

Modified Version

 * Anub'arak's level 20 Talent, "The Traitor King", passively incresases his Health by 10% and grants him 20 Spell Armor. Can be activated to grant him 75 Armor for 4 seconds on 60 second cooldown.
 * Cho's level 16 Talent, "Twilight Veil", can be activated to instantly switch his Trait to Ogre Hide and increase its Armor bonus from 25 to 75 for 4 seconds. 60s cooldown.
 * Rexxar's level 20 Talent, "Hardened Skin", can be activated to grant himself and Misha 75 Armor for 4 seconds. 60s cooldown.
 * Sonya's level 20 Talent, "Ignore Pain", can be activated to grant 60 Armor for 4 seconds. Can be used during Whirlwind. 60s cooldown.
 * Tyrael's level 20 Talent, "Defense of the Angels", grants 50 Armor for 3 seconds. Each Basic Attack or Basic Ability that hits an enemy Hero increases its duration by 0.5 seconds. 60s cooldown.

Removed
These Heroes no longer have Hardened Shield as a Talent option:
 * Arthas
 * Chen
 * Dehaka
 * Gazlowe
 * Leoric
 * Stitches
 * Stitches also had a modified version of the Talent, "Shambling Horror", which could be activated to grant 50 Armor for 4 seconds and prevent Stitches's Movement Speed from being reduced below 100%. 60s cooldown.

Similar effects
These Talents replaced Hardened Shield on their respective Heroes as a means of late game damage mitigation, but do not share the mechanic of being independently activatable Armor effects like the original:
 * Arthas' level 20 talent, "Anti-Magic Shell", grants immunity to Spell Damage for 4 seconds and heals for 25% of the damage prevented. 60s cooldown.
 * Chen's level 20 talent, "Untapped Potential", grants 75 armor for Wandering Keg's duration and 3 seconds afterwards, and increases the Movement Speed bonus of Wandering Keg from 75% to 125%.
 * Leoric's level 20 talent, "Shroud of the Dead King", grants Protected for 3 seconds. 30s cooldown.