6(Harry Potter)

An Au where everything is the same until Harry's third year when a student from another house(who it is, the year, the house can be whichever the writer wants but it can't be someone from gryffindor) goes to Gringotts to make an inheritance test and finds out that Harry is not Lily's child and that they were siblings/cousins besides being related to some other students and having no idea about it.

So said students decides to create a trend(maybe they are muggleborn or half-blood) which leads every students to go to Gringotts and do an inheritance teste were many secrets are revealed(like who they thought as their parents/siblings weren't, they had magical family, finding distant family members they never heard about)

Which leads to the students banging up together to find out the truth about why they had been raised by lies(yes, it will be a bad Dumbledore but I would like all Weasleys to be good...and by all I meant all and not make Percy the odd one out as most do...which never made sense to me in fics were Dumbledore is bad and they make Percy be in line with him when Percy is one of the canon characters to not truly believe Dumbledore and in his plans).

What is revealed in the inheritance tests, the ships, how they would destroy Dumbledore, etc is up to the writer but I request that Harry is not the heir of every powerful mage to ever exist as it gets tiring to see that(yes, he can be Peverell heir but maybe make Neville the Gryffindor one, Daphne the Slytherin one, Padma or Parvati could be the Ravenclaw one, Hannah be the Hufflepuff one, Luna could be Merlin's heir, Marcus could be Arthur Pendragon's, a hufflepuff could be Morgana's heir, etc...go crazy and run away from the usual choices people do, you can even go for ocs or barely mentioned characters).