I just need a run down of what I've missed.

So. For starters, I haven't played in years. I just got back on and now have an adept necro, and my son just started yesterday as my first ever main a Pyro (super proud dad moment) but uhh... Wth are these extra schools? I missed all that. I think the last time I played was back when pets were first intro'd in. I ended up snagging a heck hound and then kinda... Idk school took over I guess. What is all the new stuff? Like arc 1. Do we finally have a story? Will there be more? (For reference I was like lvl48 Pyro, 32 ice, 37 storm, 25 myth, and I believe a 13 life, idk didn't like the life as main too much..) When I quit years ago, I did get lucky with my mom buying the year long pass thing so I had the realms and all that. But yeah. Anything that can bring me up to speed would be amazing❤ thank you all!