The format here is web serial, so if it was done that way here it'd likely also stop making sense even if internally consistent
...No seriously go play or watch a playthrough of the Legacy of Kain series.
The very fact that you think that a linear story like a web serial can't have multiple internally consistent plot twists that twist the entire setting around the bend means that my only reply is to either spoil the entirety of the Legacy of Kain series to you or tell you to go play/watch it.
For the sake of my argument making more sense the Legacy of Kain series works as a linear narrative with multiple plot twists that change the entire setting because it gives itself enough narrative space to twist around without breaking or losing internal consistency.
Like each game in the setting has its own internal plot that is consistent and makes sense as a plot of a video game, but then on top of that each subsequent game gives more lore about the setting itself that then recontextualizes the events of the previous games without making the stories of those games less, but by showing more context as to what happened in them.
Like a small spoiler for the series a boss from the first game called Nupraptor the Mentalist is said in a throwaway line to have corrupted the heroes of the land Dark Souls style including the main protagonist of the first game Kain who has been corrupt from his birth. This fact is repeated in subsequent games very rarely and only by characters who would be aware of who Nupraptor even was and what he had done.
Only at the end of the fifth and last story game of the series is Kain purified right before the final boss fight and his actions in the last boss fight beg the question of how much free will did he have in the actions of the previous four games.
Like yes Kain is a very willful character in the stories of the games, but his corruption affects in a very literal way how he sees the world which means that no matter what he chose his choices have never fully been his own because he could never fully grasp why he was making them.
And because the POW characters for the player are either Kain or people whose lives Kain has shaped that means that the entire setting suddenly tilts sideways as Kain learns things about his world that he did not know, but the player did from other games' protagonists, and then responds in a way that leaves the player wondering what exactly will Kain do now that he can no longer be the same person he was.
This Edit: is how good plot twists are done: By keeping the characters consistent, the readers/players well informed about what is happening and then having the characters respond in a way that is consistent with their characterization so far and the setting itself while at the same time surprising the reader/player by their actions in a logical and satisfying way.
Way too many writers and readers think that the way to pull off a plot twist is to just be unexpected in your writing and subvert reader/viewer/player expectations in order to get that shock factor in, but the truly great plot twists are the ones that make sense as part of the story being told.
