Rod of Mercurial Form

A  is a magical rod that can transform into other items at the bearer's command.

Appearance
Rod of Mercurial Form is a steel rod engraved with tiny symbols representing different kinds of weapons, as well as the monogram "T.D.".

Properties
In Tal'Dorei Campaign Setting Reborn, the Rod of Mercurial Form changes its shape, when a creature holding the rod speaks the name of any simple or martial weapon aloud as a bonus action, causing the rod to transform into an ordinary weapon of that type. When in the form of a ranged weapon, this rod magically creates its own ammunition, which disappears after a ranged attack hits or misses.

In the Campaign One: Vox Machina, the rod was able to turn into varios items for an hour. The limitations thereof are unclear; Tary claimed "[the] rod can become anything".

History
Tary purchased the rod at some point prior to meeting Vox Machina. He demonstrated it to them in order to argue that he was a seasoned adventurer who had acquired many items in his travels. He primarily transformed the rod into weapons, which he used in combat against the kraken in the Elemental Plane of Water and at various times during Vox Machina's sojourn into hell.

Tary bet the rod against Grog's Alchemy Jug, with whoever was most liked by a woman in a Whitestone tavern taking both items as the prize. However, the winner was unclear and they chose to each keep their own respective items. Tary still had the rod over a decade later when he interviewed a number of recruits for the Darrington Brigade, and it appeared to have seen some damage. He transformed it into a sword and used it to attack Quackthulhu.

Trivia

 * Tary has transformed the rod into the following:
 * A sword
 * A flaming sword
 * A battleaxe
 * A crossbow
 * A lance
 * A flaming dagger
 * The rod of mercurial form's ability to transform into multiple weapons, including a flaming sword, is similar to another magical rod, the Rod of Lordly Might.