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Weakness Analyzer Season 2 was an item only usable in Zombie Scenario: Season 2.
Similar to Power Amplifier, it deals higher damage but only applicable to bosses in Zombie Scenario Season 2, namely Dione, Revenant and Angra. It works only if the room is not set to Ranking Mode.
It can be obtained by opening Dr. A's Trunk which can be combined from combining Clue Set 3.
After Zombie Scenario Re:boot, the old versions of Weakness Analyzer (1, 2 and 3) were removed and replaced by the Weakness Analysis Device.