Spoiler: Backstory Details
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The Story
Luna was born to negligent parents. One was an elf-a particularly fey inclined one, one foot here on the Material, one in the Feywild. Her partner, of the time, was a hedonistic man. He didn't care much for children. And her mother, well... She was not all there. So Luna's story would've ended, left in a mushroom circle on the night of a full moon, had she not been found by Velguardr. The druid happened upon her, and seeing no one to care for the baby, took her in themself. Velguardr was new to being a parent, but they did their best, and raised Luna with a strong moral compass, a strong set of skills for the wilderness, a heaping helping of magical knowledge.
In time, though, Velguardr moved on. Like the passing of the seasons, a druid of their power is not beholden to one location, but to the world at large. They felt that Luna had learned enough to survive and thrive on her own.
And they were right-for a time.
Wilhelm's betrayal of norms was not without its buildup. King Harald and his father before him were on good terms with the local circles. Luna herself, from her home near Wilhelm's domain, worked with the local villages and townsfolk to provide for good crops and safe, sustainable lumber. But, as Wilhelm looked to consolidate power in his urge for the throne, he needed someone to make the enemy. The king was, for the moment, too well-regarded to realistically besmirch.
So, with a few "Druidic" agitators setting fire to fields, Wilhelm painted Luna and her associates as the enemy. As the most powerful caster and fighter amongst her folk, Luna knew that fighting back on their own would be suicide. She directed the others to hold fast, stay safe, and be smart; while she went directly to Harald. By the time she arrived, Wilhelm had already begun his full assault, making her message moot, but her powers all the more needed.
The Circles
Luna is a 5th level Druid. The rest of the druidic folk maybe hit level one. A good number of them can cast cantrips a couple of times before tiring out. Some can cast basic healing spells, helping with minor injuries. But the only one with real combat power is Luna. Many of her friends know rituals, but those are hours or days long affairs requiring much setup.
Luna As A Person
Despite Wilhelm's trickery, Luna is friendly and trusting. She always tries to see the good in others, is always ready to lend a helping hand, and can easily be considered naïve because of that. She is quick to defend her friends and comrades, and quick to consider someone a friend to boot. But betray her trust, and you will see her fury.