It took a lot of digging but I found out why Zed stole magic from the Vastaya
and I shouldn’t even say stole it because he didn’t steal it, he was nullifying it so that the
could no longer use Vastayan magic to create weapons. In FACT, they were the ones that created Jhin’s whisper!
It’s almost ironic that Zed fought Xayah and Rakan for endangering the magic of the land, when he too was trying to stop people from using Vastayan magic. Maybe they’re not so different after all?
This explains a lot, it shouldn’t have been that hard to find the information though.