Amumu Build Guide by
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Sometimes I found when using Amumu to duo lane (usually bottom assuming you have a jungler who is NOT you), sometimes I would dominate hard. In this case I'd use this build. What I find mostly is although you've lost tankiness, generally if you plan things well your enemy will be running for their lives instead of trying to attack you.
I would always recommend using a more defensive build for jungle or just in general. This is a rare build to use but it hits like a brick. Consider a "Void Staff" if they are building lots of magic resist.
Good Luck and Have Fun!