Decided to create this class the other day. Please check it out and give me feedback on its quality, and whether it needs further balancing or not.
https://docs.google.com/document/d/1E7TxkGqi6OUbnYd0i9hOJY3aB3L_vv9CRiGF09aqi_M/pub
My only two concerns with this version is:
1) It being 20 levels, since most prestige classes are only 5 or 10.
2) Since this will be from a Druid class, I would recommend instead of making its own spell progression table, to take it how most other prestige classes do it.
Here's my progression table that I would suggest:
Though, even this is part on the more overpowered side, if you compare to existing prestige classes. (Just take a look at the tables). The full BAB progression, 2 good saves, and at least 1 new Special per level, is still pretty good. The only thing I changed here was making the spell increases every other level, since full spells + full BAB progression, along with every level new Special, is a bit too much.
I'll let the other DMs offer input. But for some quick comparisons:
(http://imagizer.imageshack.us/v2/800x600q90/835/o7l8.png)
http://dndtools.eu/classes/verdant-lord/