@ze: HEY. WHO TURNED OUT THE LIGHTS?

Holy shit, KING SOMBRA IS GHOST!

All I can hear now is Gorillaz singing about sunshine in the bag, and that freaky skulldude there grooving out to it. What has this thread even done to me?
 
also
 
I hope he is voiced by Cam Clarke and mentions something about being their shadows…just…a thing.

Yeah, that was pretty dumb.

NONNONONONONONNON THAT’S ALL WRONG
 

 
put him in a bag!!! that would work much better

Luna: King Sombra, we hath a problem. Our sister kindaaaa discovered our pony slave ring to farm for depression and crystals and it’s putting a damper on our plan to overthrowing her, soooooooo expect us to be over thither to banish ye.
 
Sombra: What?!
 
Luna: But here’s the thing, she can’t perform any banishment spells without our help. So we shall syllan a grand performance in the fight against ye, convince my sister we hast nary a chance and that the only way to defeat thou is to turn ye into a living shadow…
 
Sombra: Uh huh.
 
Luna: AND THEN banish thou.
 
Sombra: …And you’ll totally un-banish me later, right?
 
Luna: Oh yeah, you’ll just be underground for about a day and we’ll get thou out. But only if thou don’t tell her that we were involved.
 
Sombra: And I get to rule by you’re side as my Queen, right?
 
Luna: Uh, yea varily.
 
Sombra: Then I accept your proposal. The night shall run eternally!… Oh, and my Queen. Wuuuuuuuuuv yoooooooooooou!
 
Luna: …We wuv y- Eck.

First of, don’t forget that this time Celestia did it together with Luna.
 
Maybe they didn’t have a choice. They tried defeat Sombra, but even after ‘death’ he managed to save his ghost form (the shadow cloud). Luna and Celestia seeing that they’re unable to destroy him completly, they sealed him in the ice of arctic north.

Just ignore him. We’ve got more immediate problems. Like those bloody daemons in the bathroom.

Hey Sombra, don’t mess with me, I’m from the Internet and I know linux!

@King Sombra  
Cool story, bro.  
I mean, come on… how scary is a living shadow?
 
…
 
Wait a second.  
 
IT’S TERRIFYING!

@King Sombrero  
Whatever you say, I’ll just be here unthreatened and waiting like

SOMBRA! SOMBRA… not SOMBRERO

LIKE I SAID.  
YOU ARE ALL ON MY SHITLIST.  
WHEN I AM DONE WITH EQUESTRIA, YOU WILL BE NEXT.

Also @King Sombra  
Aww, you upset at the youngsters, gramps?

Actually, I think it’s kind of like that episode of Samurai Jack where he meets that big rock dude inside the mountain, who’s really just an old viking king imprisoned in crystal by Aku and learned to control stone as an unintended consequence.

NOBODY MOCKS THE RIGHTFUL RULER OF EQUESTRIA.  
THIS WHOLE SITE IS ON MY SHITLIST.

Oh, stuff it you one thousand year old codger.

I WILL GET MY REVENGE  
AND YOU CELESTIA WILL SUFFER THE MOST

good princess best plan

YOU DARE TO MOCK ME

So basically the plot of The Mummy.

They just fired it at King Sombra and hoped for the best is what I mean.

Well… I think the elements are just a ‘point it at something and hope for the best’ kind of weapon: you never know what it’ll do to something.