Unstable Greater Truesteel Essence

Unstable Greater Truesteel Essences are what remains of Greater Truesteel Essences, which can no longer be crafted. Prior to Shadowlands, using this item "restored" it into a Truesteel Essence and 25 Sorcerous Fire.

Source
The original version of this item, Greater Truesteel Essence, was crafted by blacksmiths with a skill level of 1. The recipe was learned from Recipe: Greater Truesteel Essence, which could be purchased from The Forge at Lunarfall or Frostwall, or from the blacksmithing vendor in Stormshield or Warspear.

Required tools:
 * Anvil, Blacksmith Hammer