Banefire

Heatless flame the dead fear, burning only where the old bones will it.

Heatless blue, green, or purple flame with no obvious fuel source, common in Barrow Builder tales as a ward, prison, or uncanny barrow feature. Spirits and ghosts fear it; some barrow inhabitants can control it. It burns only where intended and is anchored to the blackened bone of a sacrificed mortal.

Kind Environmental or Procedural Threat