i had theory...

Can’t be, if that were the case Asta would not be able to wield the power he has now. He’ll have to relearn everything from scratch because he’s never learned how to use magic since he’s never had any.

maybe a demonic power to unleashed completely the demon residing on him and because it is demonic power he will be able to wield the swords..anyway that is just a theory..like they've said having no magic power is very rare so i think it is sealed somewhere..

Bot Yuno and Asta have the pendant, I think

Only Yuno has the pendant if I’m correct, and I think the pendant connects to Yuno and where he desends from. Like his family or native town...

I don't agree.I think Yuno's pendant is one of the magic stones.
My theory is that his fathers must be nobles and left him to protect the stone and him from the bad gays. I think Astas's is also a noble but since he did not have any magic, his parents left him. Well, i hope the author reveals both pasts.

they have pendants?

fathers (parents).My mistake.

Only Yuno, see first chapter.

Tht’s true, it is just Yuno. I thought it was Asta as well. But I think that maybe Yuno is a descendant of those elves that are loved by mana.

It could be true. I noticedanother mistake, gays is guys. Sorry i was playing a game and didn't pay much attention.

I agree, so is Asta a descendant of the person that they said owned the five stars before? I think that person was also an elf not blessed with mana, but with the power to nullify and repel mana. Both of their pasts are a mystery for now.

they are both left in the church at the same time so maybe they are connected with one another..maybe they are siblings?? (or maybe not due to differences)..maybe they are born with forbidden love between a demon and the one who is loved by a mana(magic)..and they are left to church to be protected..(づ￣ ³￣)づ