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MIDA (an acronym with an unknown meaning) was a revolutionary government that came to power on Mars in an assumed alternate timeline, and the creator of the weapons MIDA Multi-Tool and MIDA Mini-Tool.
MIDA was a rebel group that seized control of Mars. During its brief reign, MIDA was responsible for the deaths of 10% of the Martian population. The government eventually fell, and its surviving loyalists were forced to go on the run from threats such as "battleroids".
Around the date of November 17, 2472, in the alternate timeline, two survivors, carrying the MIDA weapons with them, learned the location of a "salvaged construct" that they hoped would allow them to flee somewhere safe and thus preserve MIDA's ideals. One survivor, Strauss, fled the planet, but the other traveled deep beneath the Martian surface, guided by their Mini-Tool in response to their request to "go somewhere better." There, they apparently found a temporal anomaly that allowed at least the weapons to pass through. The weapons entered the Guardians' timeline, were discovered by Commander Zavala, and the details of MIDA were extracted from their log caches by Lord Shaxx using their electronic warfare functions.
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