Does it still activate once the Immortal's shields are depleted and the incoming damage hurts the Immortal's health? And with all upgrades, is the damage reduced to 7, instead of the usual 10, or how does that work?
While on the subject, can you answer some of the more specific questions from this post here please? http://forums.battle.net/thread.html?topicId=16409962156&sid=3000&pageNo=2#31
Thanks in advance. (I hope!)

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Q u o t e:
Does it still activate once the Immortal's shields are depleted and the incoming damage hurts the Immortal's health? And with all upgrades, is the damage reduced to 7, instead of the usual 10, or how does that work?
While on the subject, can you answer some of the more specific questions from this post here please? StarCraft II Fan Site Q&A Series http://forums.battle.net/thread.html?topicId=16409962156&sid=3000&pageNo=2#31
Thanks in advance. (I hope!)

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Hardened Shields reduce the damage of incoming high damage attacks to 10 if Immortal's shields are up. After Shields are depleted, the damage hurts the Immortal's life directly.

About the Shield upgrades, it goes like Damage - Shield Upgrades and then - Immortal's Hardened Shields. For example, if your Immortal shoots the enemy Immortal with fully upgraded shields, the damage will be 10: 35 (20+15 vs Armored) - 3 (full shield upgrades) = 32, and it's more than 10, so the enemy's Immortal takes only 10 damage by Hardened Shield. But if your Disruptor shoots the enemy Immortal with fully upgraded shields, the damage will be 7: 10 - 3 (full shield upgrades) =7 (it's below 10 damage and so Hardened Shield won't do anything).

It's little bit complicated to explain how the damage goes but basically it is like, Damage - Shield upgrades - Hardened Shield.

As a side note, the Immortal's Hardened Shields are again a researchable passive ability in the Cybernetics Core in our latest version of the game.