Fate Tools (命器) are one of the two main types of weapons used by cultivators (another are Longevity Treasures).
Fate Tool's main use is to protect the Fate Palace and attack the enemy. Under the majority of situations, only on the battlefield would there be a need for a Fate Tools.
Fate Tools are further divided into Life Treasures and True Treasures.
Links 1 Appearance(s) of Fate Tools