[Taqwus]

Nature is so darn useful -- supply items, healing, decent commander summons (Firbolg for archers / commanders, Lamia Queens for sorcery, Feathered Serpents for astral/nature/holy, Faerie Queen for healing), decent chaff (vine ogres / vine men, which don't require special leadership), Gift of Reason to play with... oh, and Relief, which is just brutal when combined with Communion, or, perhaps, Rigor Mortis. Oh, and nature lets you find sites which get you Witches, which opens up elemental magic. And some may benefit from Mass Protection, so long as they're not near Abysians or other heat-radiators.

Unless you're playing the undead masses, in which case supply / chaff / relief are much more minor concerns, it's very very nice to have.