Everypony knows about the tale of how Discord was reformed, and being friends with the Guardians of Harmony helped convince the citizens quicker. However when an urge to cause some chaos hits him, and since most of his methods have a counter, he goes for a method that will bring about maximum chaos...
and the apocalypse...
👍
So far it's quite interesting! I wonder of Discord has been taken over by his own magic. Since he seemed conflicted about his actions.
An eon could be a billion years. Equestria's history is, generally, several thousand years long at most. My point being, an eon is a bit much unless Discord is wanting to work with primeval bacteria.
Reading this, I'm off put to some extent. The writing could stand to be a bit more grounded, building the scene up and such.
This is what my professor likes to call an intruding narrator. "King Gale's mind crashed and rebooted" is not something a griffon of his era would ever think. It's one in an era with computers might think, but not one in ancient times. This throws me a bit out of the scene. When writing, you can and should try to make the narrative fit the character in question.
As an example, I'm going to write two paragraphs about a being encountering an obstacle in the road.
See the difference here? They're both worried about being stuck, but the former is concerned about the oak tree being cut and worrying at what she's going to do, while the latter is suspicious and thinking it's intentional sabatage-she doesn't care the tree is an ancient oak.
Why did they both gulp? Both sisters are well aware of his potential for shenanigans, and he just said he was having fun. Celestia in particular has been dealing with politics for a thousand years. She surely has better control to the point I don't think she'd be able to let her guard down hardly.
Overall, my problem, and sadly one reason I'm having a hard time getting into this story is context. You're throwing us into this story with little build up of the setting or how things relate together, so without understanding really the connections, I'm not connecting with any of the characters.
Plus, you jump from pov to pov this chapter alone. Who am I supposed to root for? Luna? Discord? Gale?
Just is a bit of a weasel word. It doesn't add much to a paragraph or narrative at all.
Why does Celestia think this? Tirek ate Discord's magic. The rainbow powers look identical to the elements, and they took Tirek down while fixing Equestria.
Her shouting "Noooo!" seems excessive to me. This may be my own interpretation of Celestia as a master at self control after ruling Equestria for a thousand years, but I think such a reaction would need to to be in response to something much more extreme and/or absurd and comic.
So, reading through this, I think I know what's bugging me. It's how you've written Celestia. In the show, she's occasionally overwhelmed, but she doesn't give up. Heck, she smirks at Tirek when he tries to take her magic and fails. This Celestia is mopey. She's not outright angsty, but is so depressed about the situation that she constantly goes on and on about it without trying to offer solutions and shoots down others. I'd expect this of a Celestia who's seen a problem beat her into the ground for decades, not over Discord's usual shenanigans which are annoying.
I like this bit. Something about Celestia just being delighted at some nice tea appeals to me.
A couple grammatical mistakes here-strategic and shenanigans, for one
So, on reading this...I like it. Yeah, I know I criticized the above, and I don't like how you've written Celestia. But, the latter half of the chapter caught my attention. I liked reading the mane 6 discuss strategy, and Fluttershy scolding them about the rumors on her abilities.