Levistus's_Leviathan
5e Freelancer
The original 5e PDK was notoriously one of the worst and most boring subclasses in the game. It did a very, very poor job of emulating the niche that it was meant to represent. I don't care a bit about retcons so long as the change is good. I think it's disappointing that they seem to be outright abandoning the concept of a Warlord-lite Fighter subclass, but think practically any mechanical change from the original PDK is automatically an upgrade. So I rated this Yellow overall and for most of the individual features. I think this needs a significant rework, in lore and mechanics. Maybe it shouldn't even appear in this book, and instead be postponed to the next Tasha's/Xanathar's style book.
I dislike having another Fighter subclass that scales off of Intelligence. This would be the perfect time to use Charisma. I also suggested that they expand the subclass's niche to include all Gem Dragons, which would differentiate it slightly from the Drakewarden without restricting the lore to being tied to a single dragon type.
An important thing to note is that the Dragon companion's attack bonus, damage, and AC do not scale like they do for most other "pets" that have appeared post-Eberron. And waiting until level 15 to be able to ride on an actually flying dragon is way too long. People will choose this subclass to be able to ride on a flying dragon. Most campaigns don't make it to level 15.
I dislike having another Fighter subclass that scales off of Intelligence. This would be the perfect time to use Charisma. I also suggested that they expand the subclass's niche to include all Gem Dragons, which would differentiate it slightly from the Drakewarden without restricting the lore to being tied to a single dragon type.
An important thing to note is that the Dragon companion's attack bonus, damage, and AC do not scale like they do for most other "pets" that have appeared post-Eberron. And waiting until level 15 to be able to ride on an actually flying dragon is way too long. People will choose this subclass to be able to ride on a flying dragon. Most campaigns don't make it to level 15.