u/Dense-Evidence5529

Hello everyone, I am currently trying to figure out a book I read when I was younger. It was a series consisting of thick chapter books about magic. The first book was purple and the second I believe was green. I think it may have consisted of 3-4 parts. I just remember that it might have a "W" as the first letter in the name. The cover didn't have any drawing other than the name and color and maybe a carving in the background. I don't remember much of the series only that it kept me reading but it was read a lot from other peers. Anyone might known what I'm talking about?