I’ll answer these in reverse order-
The girls powers are basically what they had in their canon series. I’d say that because the area in the village used to be inhabited by ancient creatures, Belos got a hand on some DNA and mixed with the Cadou for various subjects.
-Vanessa doesn’t have a Cadou and since one of her parents didn’t get one either, she’s the least powerful, appart from being a bit more durable.
-Meteora’s powers are a mix of her parents since they both got a Cadou. (She does not have a Cadou and doesn’t need one). She could mutate like her mom but it wears her out.
-Molly has a very weakened version of her powers from TGAMM. She can make flowers grow and likely has limited healing powers because of this (I haven’t explored this in full yet).
-Luz is actually the most powerful because when Eda gave her a Cadou, she also used Titan’s DNA and the actual extent of her powers are kept a huge secret. (Obtaining Titan’s blood/dna is impossible to get in this au.) But Luz also has a mutated form of her own because of this, which was also kept a secret from Belos.
-King actually IS in this AU. A lot of the creatures were forced to leave the lands when Belos took the megamycete for himself and started trying to kill them all. The creatures managed to stay hidden and King did get to be with his Dad for a time until he accidentally entered our world with no way back home. Eda found him and figured out who he was and she’s been hiding him in her home away from the village and Belos. Only she and Luz know about him. (Part of the reason Papa Titan is posing as a Merchant during the main events is to try to find his son, but he does ally himself with Star-and Luz upon meeting her-when he sees a way to defeat Belos and return the lands back to their rightful inhabitants.) You could say that King is also technically a member of the Clawthorne house and is Luz’s ‘brother.’
-I haven’t figured out specifics yet but I’d say Vee does exist.
Ok now for the baptism/adoption ceremonies.
-In all four cases they happen in the church.
-The water used is indeed infused with a bit of the megamycete. It’s only used for baptisms since Meteora and Vanessa don’t have Cadou in their bodies to the extent of their ‘cousins.’
-Expect from religious speech from Belos that only his followers would believe before the ceremony properly starts.
-In the case of a baptism, the parent must answer the following during the process upon presenting the girl to Belos:
-“Do you promise to raise your child to fulfill their familial obligations to your house and this community?”
-“Do you promise to do whatever it takes to protect the child and thus your bloodline?”
-“Do you promise to instill loyalty in your child?” (Translation: “is your child going to be loyal to me?”)
-the girl is then baptized with water and declared heir to the family name.
-Vanessa’s wasn’t too remarkable, but Meteora’s father wasn’t even allowed to attend due to how his Cadou affected his physical appearance and she was required to keep her more unusual features hidden. However she almost succeeded in biting Belos’ finger off-word has it that you can still hear Bill’s howls of laughter over that moment echo in the church on quiet days.
-In the case of the adoption ceremony, the girl is transferred from her biological family to Belos before she can be given to her new adoptive parent, who must answer these questions first:
-first is the same as the first question from the baptism ceremony.
-second question is same as the second question from the baptism ceremony but without mention of a bloodline.
“Do you understand that the gift you are given should be treasured carefully?” (Translation: “I will let you take this child as your own but know that I can easily take them away from you.”)
-“Do you accept this child as your own and are willing to give your name to them?”
-the girl is then handed off to the lord and declared heir to their family name.
-neither Camila nor the McGee family were happy about being forced to give up their child to people they barely knew at the time (especially given that the girls were told that their families would meet unfortunate fates if they revealed the truth behind Belos and the lords). Eda and Scratch were not happy about that either and they got their respective kids out of there before Belos’ more devoted followers tried to get close to them.