Druidic warriors are not exceptionally skilled, but frighten enemies and encourage allies to fight.
Inspires Friendly Units
The Drwdae (Droo-day; "Druids") are not actually generally warriors. However, there were British warrior-druids; war was a fine profession, and even the best educated of society sometimes engaged in it. These particular Drwdae are warriors, however, and akin in many ways to the Carnutes of Gaul, in that they train a great deal and have the duty of protecting sacred places. They are extremely well motivated and disturbing to enemies, and inspiring to allies, but exist in such small number they're no use alone; they must be supported by other men to fight at their utmost.
Historically, British druids main duty was philosophical, legal, and religious. Warriors of this class did apparently exist though, in small numbers, acting as what were essentially temple guards, and organizers of defense. While the druids are most notable in late Celtic-British history as having been slaughtered by the Romans at Mona, graves and legends of Celtic history do attest to the druids engaging in combat. In fact, so frightening could they be, conflicts were sometimes averted when the druids took the field in support of one tribe over another; an alliance with the druids meant an invariably great amount of power in Britain.