How do you kill a Tornado??!?!!!!

You don't.

That is, you can't destroy the tornado. You either need to ride a flying carpet or flying broom through the bottom (for some reason, the tornado doesn't detect it) OR you can ride a creature (for example, a cow) and have it walk through and be blown over the top of it.

It's really difficult, so keep persevering. You'll get it eventually.

I spawned a fan and blew the starite into the tornado... It the flew right at me.

There's a few different ways I've found to get past it. The first one I got to work was putting a tornado shelter in the path of the tornado. Click on it to get inside, then once the tornado is on the other side, click again to get out. Doing it right is tricky, and it took me a few tries to get it right, but it should work. Also, you can destroy the tornado with a black hole. Just be sure you don't put it too close to you, or the starite.

You can easily destroy a tornado with a black hole and finish the level easily.

I stuck an abyss under the tornado and walked under it.

I used a jetpack to launch over the top of the tornado as it passed under the second ceiling alcove, so there's always that option.

Antimatter

I shrunk the tornado with a shrink ray and jumped over it(with rocket boot and pegasus and wings)i was trying to get prodigy

I attached like 3 ropes to the starlite and then drug it over. it look me all of 3 secs. The wind from the tornado will whip the starlite to your side of the screen!

I used a grappling hook on the steel above and managed to swing over the top of the tornado. Took a little bit though, but it went eventually.

I walked through it. Hahaha. Seriously, all I did was walk up to it and stay to the right. Eventually maxwell just bounced to the other side and I didn't have to use any objects~

I just spawned another tornado and the first tornado bounced into it, sending it into the starite and nearly instantly after that I had it in my hands. No moving at all.

Black hole, everything, nothing, and antimatter are all fatal to the tornado.