Iron, if it is unjust and dishonorable to whatever oath may be shattered by ice magick. You might also try becoming something other than a fairy, if you are not where you wish to be, at least for a time.
"A female faerie Seer trapped within an Iron circle of binding, required to tell the future to a horrid human. Weathered and worn clothing, welts and bruises, sullen disposition." detailed matte painting, deep color, fantastical, intricate detail, splash screen, complementary colors, fantasy concept ...
Iron, if it is unjust and dishonorable to whatever oath may be shattered by ice magick. You might also try becoming something other than a fairy, if you are not where you wish to be, at least for a time.