A Valinhall power, wind assists a Dragon Fang in cutting invulnerable materials.
The power of wind is rarely used in the books and its limitations are up for debate. However, on a most basic level, wind can be called on a Traveler's Dragon Fang, appearing to heat and sharpen the blade. This ultimately has the effect of allowing the Dragon Fang to cut materials that would normally be invulnerable, notably, Tartarus Steel. The limits on what it can and cannot cut are unknown, as is its location and challenge within the house.