Are there different types of Druids? And how did they come about?

Druids typical study one aspect of knowledge. Those are Bards, Healers, Lawgivers, Seers, and Warriors; in the 5th Century, Warrior Druids were a nearly lost specialization. Druids were created by Dagda, the All-Father, as a gift to the Gaels, ending their brief war with the Tuatha as part of the Great Agreement. One of the Druidic gifts that Dagda granted was the ability to speak mind-to-mind with animals, a gift that was lost in time.