In light of the mutual threat of armed invasion by Norse or Britons, the Otherworld creatures have joined forces with the Celts to form a powerful combination of magic, nature worship, and arms. The Hibernians are made of the Human Celts, who demonstrate a profound affinity with nature. The Elves are beautiful tall, thin, humanoids who specialize in all forms of magical spell casting, and have the ability to bear arms. The almost-giant Firbolg combine nature worship with practical magic and arms skills. The small, quick Lurikeen show an aptitude for spell-casting and dexterous fighting.
Hibernian magic comes from two sources.
Their most powerful spells come from the Otherworld Elvish mastery of primal Arcane magic. Other casters also have a variety of nature-based druidic spells.