Done Lost Lives with Wither Chance Box

So, close to my island and now another island my chance box released a wither... I know it took two of my lives and I don't know what to do or how to get rid of it. Any help would be nice.

 

Oh, a quick response the place I saw the wither last is

-1111, +1300

my own location is -899, +1500

 

If you get close enough to load the chunk it's in but far enough to not aggro it then it should gradually float down into the void.

 

you know what? why don't we get chance cubes disabled alltogether to stop these complaints, I don't want to see someone whining every time their base gets rekt by an ender-dragon or wither or whatever that they chose to unleash upon themselves, because I KNOW it will happen

 

Don't gamble if you can't afford to lose.

 

I was more worried about the other person who's base the wither was camping at not that anyone cares about that right