uh, throwing Chuck Norris at them?

You cross the streams.

Easy! You call the The Doctor to use his special, little De-MatGun but modified to their intended targets.

That Eldritch Abomination sounds..tricky though. Whatever you do against it will have rules you can't compremend so you've to assume any conventional (or even non-conventional) weapons won't work. Maybe get a friendly EAs on your side. :P

1) Have him prove he is truly the one who warps reality, in effect warping his/her/its reality and destroying the thing.
2) Time paradox a la Looper.
3) Show him since he/she has no faults or weaknesses he/she is truly not invincible because everyone has some sort of weakness.
4) Atheism.

Hire Chuck Norris to do it!

1) - 4) Expose to Justin Bieber.

1. Hulk Smash
2. Hulk Smash
3. Hulk Smash
4. Hulk Smash

you stop believing in all of them of course!

1. Find his lamp, rub it, kill him with a wish.
2. Manipulate him into killing his own parents before he was born.
3. Kryptonite.
4. Punch it really hard.

1-4

Go beyond the impossible and kick reason to the curb!

I say we take off and nuke the entire site from orbit. It's the only way to be sure.

Hit them in the head with a stick !

1. Just vote for another politician next time.
2. He can master time all he wants - when I am late I am late and he will starve before I arrive.
3. Ask him to make sense of german finance and tax law. At some point he WILL kill himself. And even if not - he will be out of your way, since he will be busy forever.
4. Again, just vote for someone else.

1. To defeat the reality warper, shoot at it until it dies.
2. To defeat the time master, shoot at it until it dies.
3. To defeat the invincible superman, shoot at it until it dies.
4. To defeat the eldritch abomination, shoot at it until it dies.

Just think of Cthulhu.