I'm gonna be honest here,
there is no point to this series. Let me elaborate for a moment, sequels are the a tricky subject in writing they happen in a world we are already familiar with and know the rules of but tell a new and exciting story. At their core they should be able to do that, but the face a number of problems.
For starters we the audience already know the world, they have learned along with the first generation cast all that the author had originally planned to show and tell about it. As such, the new story has to take the same setting and try something new.
Second issue comes with the knowledge the main cast already had acquired, this means we have also acquired it so delivering new information might make it invalid or create holes in the new narrative. The next is actually the real downfall of sequels and the point where they all fail; How to deal with the original cast.
They are usually dealt the worst hand, it's simple really after the original group have finished their journey they are seasoned warriors/adults/travelers/(whatever they set out to do or even failed to do cause life) this means that for the new to work they need to be brought back to level 1 (original state they were when they began their first journey [mentalilly: No knowledge about the new developments even though they already learned all there was to learn; Physically: Strip of most of the strength/power they gained during their first travel]). Like this they are made into a caricature of what they have been known for and this in turn makes their initial ending worthless, since they usually aren't the protagonist of the sequel they will never regain the glory they were known for, making the audience dissatifice in the process.
There are many other problem with sequels and there are some that have transcended the originals, so there can't be an argument to say that they are all bad, but this series is a bad sequel as it fall face first in all the errors and continues to destroy the legacy created by the original, which isn't much considering how drawn out, pointless and lost of an actual focus the author made it. So it shouldn't be expected much to begin with.
If you made it till the end; Thank you for reading