From publisher blurb:
5E Character options inspired by The Academy of Magic and Engineering
The prestigious Academy instructs dozens of the brightest pupils, providing the expertise needed to usher in a new age of engineering wonders, magical theory, and blending the two into truly amazing feats of accomplishment. From the mountain peaks of the city-state of Bridged City, the Academy stands as an example of the innovative, mystical construction techniques developed and taught since the Divine Wars.
The most accomplished minds at the Academy pioneer advancements in blending magic with mechanically focused magic. Machinae are specially crafted mechanical magic items. These creations, based on the formulae of established crafts, are capable of even more wondrous feats of power. But...only the trained may reliably use these complex devices.
Vis ex Machina includes a small selection of subclasses, feats, and other options for characters who have attended such an Academy and absorbed its curriculum. The system for creating and using machinae is detailed and includes a few examples of the mechanical magic items.