You are the Wither Mod makes it so that you are the wither. As the wither, you can fly in survival. You can also make wither skulls to throw and explode. The animals will run away from you, but the mobs will not attack you(except the enderman). You can battle the enderdragon, which is like the point of why the enderman is still attacking you.
Forge is now needed to install, so no more modloader, unless you are using an older version!
How to install:
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Download Links for You are the Wither Mod:
For Minecraft 1.5.1
For Minecraft 1.4.5