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RF Knowledgebase · RF Knowledgebase · Game Guides Traps & Towers. RF Knowledgebase - Your reliable source for all knowledge regarding RF. Report abuse. Massive Armored Units (MAUs) are mechanized walker units in the game universe, similar to mecha. The ability to pilot a MAU is a special race skill unique For RF Online on the PC, a GameFAQs message board topic titled "MAU driver question".