How do you offend an seelie?

Answer 1

If you are referring to the term for a classification of fairy than cold iron is a way to anger them as it is harm to all faeries.

Answer 2

To offend a Seelie, you could disrespect their traditions, betray their trust, or harm the nature and creatures they protect. They value respect, honesty, and harmony with nature, so actions that go against these principles are likely to offend them.