The Enchantress had an excellent conclusion to the series.
The deaths of all characters were fitting (they all died in battle).
Something I dislike however, is John Dee, switching from the bad side to the good side.
I genuinely thought (and still do) that John Dee was a perfect antagonist, and his death, would be caused by the Flamels or something like that.
However, his motive for switching (which was his 'humanity') was very interesting to see.
First Machiavelli betrays the Dark Elders to protect the humans, and later Dee makes the same move, after some convincing from Virginia Dare and Osiris making him very old.
Virginia Dare switching from bad to good, isn't surprising, and it's interesting to see. Also, her role as a 'leader' of the humans' rebellion, suits her.

Alright, now comes the actual juicy part:
For some reason, Michael Scott decided Josh and Sophie Newman are no longer twins.
Apparently, Josh is a Neanderthal, and he was kidnapped by Isis and put in a shadowrealm where time was frozen
And Sophie was a Russian, born somewhere in the 12th century, and she was kidnapped as well.

This makes the series a bit... pointless. The entire time, it's emphasized that they're siblings, twins, and 'twins of the legend'.
And when the time comes for them to play their roles as twins of the legend, they suddenly aren't siblings anymore, which is just weird.

Josh becoming Marethyu is... interesting, but weird.
After fusing the 4 swords of power, he transforms into Death.
As he (and Krishna, and Robert Oppenheimer) said: 'I am become Death. Destroyer of worlds'.
However, his entire presence in Danu Talis 10,000 years in the past, is the product / result of Marethyu.
But how could Marethyu have existed, if Josh hasn't gone back to the past yet? Hmmmmmm...
So Michael Scott has got himself a bit of a paradox here...

Generally, I think Michael Scott shouldn't have touched the theme of time travel; time travel is complicated to write, and there's a big chance of making plot holes, paradoxes, and infinite loops.
Honestly, I think Dee should've served as the antagonist, and after he would destroy the Dark Elders, he would come up with some masterplan where he would take over the world, and the Flamels would stop him.
That would have been a better plotline in my opinion.

3/5