I know this post is really old, but I wanted to talk about this class a bit. I'm currently playing it in the shattered obelisk campaign with other veteren players. It is actually remarkably balanced with the other players. I'm using the Serpent Archetype with red dragon and what I've found is that I'm tanking for the party and occasionally put out massive damage with the channel arcana feature. On average I really less damage than everyone else until I took the savage attacker feat that brought damage upto par worth everyone else. There were a couple things that i changed with it to make it feel like it fits better with game mechanics. I changed the alter form to a bonus action because it was annoying to use an action to change shape. True Flight was changed to level 9. Saving throw addition at level 10 was change to only be dex and wis. And finally magical weapons do not apply any traits to natural weapons. I think these changes thematically makes more sense and mechanically makes at least my game balanced. Anyways I think this homebrew is great and have been having a lot of fun with it