Understand Artifact is the ability of engineers. It not only allows a player to understand the mechanical and other functionality of objects, but also grants him bonuses to the chance of building functional machines.
Successive levels in the ability grant further bonuses to attempts to understand and build artifacts. This ability can be used by all at a rudimentary level with bonuses from intelligence, but much larger bonuses can come from levels in the ability.
Bards, Illusionists, and Enchanters learn Understand Artifact, but it is much more common as a backstory ability or cross-class. Any character with an interest in artifacts can obtain it easily.
Would you get understand artifact? What types of situations would it be useful for in your games? Comment below to let us know.