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From http://forgottenrealms.wikia.com/wiki/Druid:

A druid is a versatile and often heroic character, capable in both combat and casting evocations. Druids obtain these primal powers from being at one with nature or from one of several patrons of the wild, often gods or powerful nature spirits.

Due to nwn game/engine mechanics it is required for druid PC's to choose a deity to be able to cast.

KTA