I was thinking that a nice PrC for a druid would be the tribal shaman. The reason for this thought, is for a druid, it would give them access to spells that are elemental in nature, and also a means by which they can speak with the dead. Ancestoral spirits and spirit animals.
Though not as strong as priest when it comes to turning or destroying the undead, they could however erect a ward vs undead.
You could have tree spirits, animal spirits and even elementals for which they could speak.
I feel that both druids and barbarians, are both classes of nature. The druid represents the body of nature, the barbarian represents the rage of nature. If the shaman was a PrC, then both could represent the spirit of nature.
