He killed Time last he was released. Time is nigh impossible to kill, and this being I speak of didn't even use 1/100000 of its power.
"eh. Etheran will just call in all the other versions of them and Aborel, as well as all the other high powered beings they know. then they'll combine. and they will win. yay for cheating" she said, making a derp face. "honestly, dimensional transcendnce is overpowered........"
That is if they don't shred the Universe by doing so. Which would give the Dorito, as I call him, more power. When dimensions touch, they get damaged, when they converge,it shreds Universes.
"Etheran deals with keeping the balance, and they've had themselves visit before. I'm pretty sure they could do it.' she said, then blinked as Etheran popped in, scowling. "It doesn't matter. they haven't been released, and won't be for several million years. thank you" they growled before blinking out
Etheran, who hasn't been released? It was only a few summers ago, that the Dorito was released. Granted it wasn't in this world but still, are the timelines that unsynchronized??
Etheran popped back in. "the timelines are somewhat seperate. but the "Dorito" isn't due in this one for another 12 million years. I've already begun preparations. ok?"
they snorted. "of course I do. for one thing, I can hear your thoughts. and for another, that's my job"
Nightshade laughed. "Bill Cipher? He broke into this universe a few hundred years back. Princess Celestia sent him packing. Besides, from what I hear, he's dead now. Erased from existence when he tried to take over a different universe."
"there's another one of him" Etheran said, sighing. "they're going to break through from another version of that multiverse"
"Really? Well, he shouldn't be that hard to take out. Between the four princesses, the Elements, the Guard, and Lord Discord, Equestria is very well protected."
Although if he manages to enact Weirdmageddon, there would be no tricking him into being erased. All his other versions know that it is possible to be tricked. And if Weirdmageddon activates, I doubt even the Elements could stop him. The laws of Existence itself, the fundamental principles of Chaos and Harmony would cease.
"Sorry, I forget that most ponies don't use the title. Anyway, remember that Bill prefers to attack defenseless worlds. Worlds without magic or advanced science. Equestria is far from defenseless. Even if he does attack, and even if we can't kill him outright, we can put up enough of a fight to convince him to try another universe."