King Sombra proofs how stupid how stupid celestia is

So she and Luna have numbers over him, they teamed up and outmatched him, what did they do? Trap him in the Ice and let him banish the Empire with him while they got a freaking Hell called tartarus where they could put him there.  
edit:don’t mention the grammar in the title

nu! she had planned Twi ’s ßirth and çareer already, might as well go through with the plan!