First thing that caught my eye was the synopsis, particularly the first line:
A descendant of one of the last remaining Mythos clans, and the daughter of the emperor who's responsible for the shrinking of kingdoms, have to come together in order to stop time from unraveling in on itself, putting aside decades of hatred and distrust.
The way you've used a comma here makes it seem like "a descendant of one of the last remaining Mythos clans" and "the daughter of the emperor who's responsible for the shrinking of the kingdoms" are the same person. Putting the second phrase within commas makes it read like a secondary clause to describe the first person, not a secondary person. A suggestion on how to reword it I can offer is:
A descendant of one of the last remaining Mythos clans and the daughter of the emperor responsible for the shrinking of the kingdoms must put aside decades of hatred to stop time itself from unraveling.
There's a lot of just slightly off phrasing like this in both the rest of the synopsis and your story. I would recommend finding a friend or beta reader that's got some decent grammar knowledge to look over stuff before posting, because it is through the whole story and some readers will likely struggle with it. (Not sure if English is your first language or not, could be contributing.) One more note on this is that you can break up your paragraphs a little more, too - especially here:
She wasn't a hateful person, or at least she pretended not to be, but it was difficult when it came to the richest couple in Basali and their beautiful perfect ethereal daughter Princess Nera. Princess Nera with her deep olive skin, sparkling green eyes, and shiny golden hair that seemed to give her a permanent halo. Stars and shit that shines! She should focus. Today was a big day, her nineteenth birthday. Which may seem trivial to most but not to her. Not to her kind. She was one of the few remaining members of a Mythos Bloodline. Once there were Mythosi in every city in every kingdom, but now with just Basali many were lost to the nothingness, or had been turned on by their fellow man.
"Stars and shit that shines!" should start a new paragraph, since it's starting a new idea - it's a very literal redirection from the previous train of thought. Don't be afraid of having short paragraphs - they can help break things up for the reader's eyes to rest.
Aside from that, you're front loading a lot of information we don't need right at the start. The story doesn't have any room to breathe through your exposition - and you'd probably do better to give each POV it's own chapter than trying to combine them. We don't need to know in chapter one that Antlia's grandmother is the special thing needed for the ritual to get her power - you can get into that
during the ritual. You can even explore it through dialogue of Antlia and her grandmother preparing for the ritual. We also don't need to know the entire history of the kingdom right now - give readers a little time to get to know the current setting before diving into the past.
And I'm a person who
loves lore dumps and also starts with one, but basically the entire first chapter here is more of a lore dump than a story. I start with some front loaded information to give readers enough setting to understand the conversation between the two leads that takes up the bulk of my first chapter, and add more lore later throughout the story. I don't need to know how the city was founded to know it's in decline, and it's not particularly relevant to Atlia blaming the emperor, either. He's the emperor - of course it's his fault if the city is in decline.
(Aside, not sure what makes him an emperor? The lore doesn't make it seem like he conquered the land they're in now, only that he founded the kingdom after a bunch of... refugees? arrived there. Or his father did? But I digress.)
Chapter one doesn't need to be a synopsis of all the history behind the stakes - you can establish Antlia's goals without throwing everything out there. Seconding that there needs to be more detail about where in the city Antlia is - you say she hates that she's never gotten to see the city the way her grandmother did, so tell us the stories and have Antlia compare those stories to what the city looks like now. It'll serve a dual purpose of establishing that the city is in decline and that Antlia seems to have a personal issue with that. Don't tell the reader about the ritual in detail - just stating that she's about to gain power is enough to tease the reader into wanting to read more.
Similarly with Nera, instead of just running through all her unsuitable suitors, open with her rejecting the latest one. Have her argue with her father directly about her qualifications to rule. Establish her relationship with him, especially as he's also a central figure to the plot. It feels like you're trying to get as much information out about the plot as quickly as possible, but we don't know your characters the way you do. Readers need to get to know them before they'll get attached to them. If you don't want to introduce the emperor so soon, give Nera someone else to vent her frustrations at - a lady-in-waiting, a maid, etc.
While I did get some difference in voice between the narration of both characters, we don't really spend much time with either of them. We also don't really get to see Antlia's living situation in comparison to Nera's - it could be good to to end Antlia's POV with her going home for some contrast.
I do think you have some interesting world-building going on, you're just introducing it all too soon. You don't need to tell us everything at once - and hinting at a deeper plot and history gives readers more incentive to read more to learn about it. Expand on the present setting and the characters' place in it - not just their social status, but within their family groups. Is it only Atlia and her grandmother? What kind of relationship do they have? How does Nera interact with her father? Is it just her and her father? How does their relationship differ from Atlia and her grandmother?
These are just some interactions you can use to reveal more of the world in organic ways while moving the plot forward and letting us get to know your characters.
I think you have an interesting idea and some neat world-building in the setting, but it's going to need some work to really shine.
