Styx Dragon: Make the Summon Monster SLA scale from 1 to 9.
You say it gets "styx dragon SLAs" at 4th level when it does not. In the table, don't say "Styx Dragon SLAs", actually say what SLAs it gets.
It could also use just a little cleaning up.
Beyond that? I actually prefer the original Styx Dragon. It gets more cool abilities, as opposed to just... spellcasting. It feels like a real class. Beyond that, the Styx Dragon was very well balanced as is- hell, I'd say it was essentially perfect. Could've used more than just bonus feats, but there you go. I think if we