Core Q&A Expanded Answer
Druidic traditions include Bards, Healers, Lawgivers, Seers, and Warriors. Dagda, First Druid of Erin, gave Druidic Elemental Magic to the Gaels under the Great Agreement between the Gaels and the Tuatha Dé Danann. By the opening books, Warriors and Druids are distinct because the Warriors have lost their earlier Druidic identity. Breanna and Eoin later restore the Warrior Druid tradition.