Why Did Midna Shatter the Mirror in Twilight Princess?
Answer: Midna destroyed the Mirror of Twilight at the end of the game in order to prevent future troubles between the Light and Shadow Realms.
Throughout The Legend of Zelda: Twilight Princess, there were several instances where it is clear that Midna understood the importance of respecting boundaries between the Light Realm (Hyrule) and the Shadow Realm. Early on, she becomes quite upset when she’s pulled into the Light Realm unintentionally, revealing just how much she values staying true to her own dimensions and avoiding any kind of unauthorized crossing between realms. Moreover, her desire for Midna to regulate the balance has further solidified the premise that Midna intended to keep both light and shadow separate. Despite there being some uncertainty amidst numerous events in the Zelda tale, the most well-crafted theory, if somewhat speculative, points quite squarely towards the very aim of keeping realms untouched or unconnected!
Before we delve into greater exploration of the motivations associated with Midna’s endeavors throughout the game, specifically referencing the Mirror of Twilight, it is essential to outline, in summary, two prominent aspects: Her desire for the maintenance of balance within Light-Shadow realms; hence not allowing the worlds unchartedly connected and another imperative aspect being Separate realms, no union there. These key traits ultimately guide our quest throughout for the reason why – an answer we can eventually piece together – the significance the Mirror of Twilight maintained on the narrative’s landscape by Midna. Therefore Midna shatters only the Mirror by necessity, for an otherwise unpredictable future for the boundaries across realms, would manifest when the two are forever inseparable.
https://www.youtube.com/watch?v=O5hVAxjbtWM