http://littlespike8.blogspot.ca/2015/07/the-miners-house.html?m=1
PLEASE CHECK THERE FOR LOTS OF NEW STUFF!
First of all withers are very hard to find (like really hard). or you can spawn it (I showed you in another one of my posts). When first found or spawned the wither should look like this:
This stage is called: Frozen Wither. then as you can see there is a bar at the top labeled Wither. This is the Wither's health bar. And this bar should start to fill up or increase and wither will start flashing black. When the Wither's health is full the wither... EXPLODES! And starts to stay black and fly's around shooting TNT.
This the normal acts of a Wither. When the Wither health bar is half full the Wither will turn blue again but he will stay flying, shoot TNT and now he will now spin as a weapon.
When the wither is killed or defeated he will drop a nether star.
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Fun Fact: The wither will not try to hit you!?! It will only hit animals and other monsters but not other withers. Some kids do not believe me. Because they say: "But the wither hit me with TNT WAWA!" That is because the TNT accidently hit you. another fun facts are that the wither will only shoot down not up, left, right, or behond him! Cool right?