i need some help making a class

[Nyaricus]

There's a PrC from the Underdark sourcebook called the Vermin Keeper. Although as I remember, it wasn't that great.

I was just about to suggest this and say how cool it was

IIRC, a druid was the easiest (if only) entrance into this class, and it was pretty cool, granting you some neat abilities.

I would suggest you pick up this book, becasue IME, it is a great book about the underdark for *any* campaign setting, and has a bunch of really great PrC's, locals, races and whatnot in it. Also, some great rules on cramped spaces, fighting/moving in it and spelunking (that is, 'cave diving') in general. Awesome, awesome sourcebook. Too bad it wasn't more generic, so it could have had better exposure.