Crucibles are Forgotten Alchemy, Forgotten Artificing and Forgotten Jewelcrafting Profession Assets that can be acquired as necessary components for completion of a number of rare Forgotten Alchemy or Forgotten Artificing tasks (levels 1-6) and/or as optional components that will improve the chances of producing additional potions or dyes in rare Forgotten Alchemy tasks, or increasing the quality (Tier) of finished Forgotten Artificing tasks.
A [Worn Crucible] may be purchased for 15 from M'tari Prin'tal in Protector's Enclave (North corner of the Seven Suns Coster Market). Crucibles of higher tiers may be acquired from [Professions Booster Pack] and asset packs purchased in the Zen store. Crucibles are not bound and may be traded on the Tarmalune Auction House or transferred between players.
A task requiring a Crucible as an asset will take any tier of Crucible in its slot. Higher tiered Crucibles serve only to improve the chances of producing a higher tiered result in rare tasks for which they are used.
At Profession Level 3, 4x [Iron Crucible] can be upgraded to produce a [Steel Crucible].
At Profession Level 4, 4x [Steel Crucible] can be upgraded to produce a [Mithral Crucible].
There is no task that will allow a [Worn Crucible] to become an [Iron Crucible].