This subclass is for all those who are wanting a theme that makes their warlock more technological based rather than arcane. You want your Eldtrich Blasts to be themed like they were fired from cool experimental pistols? This is the subclass for you.
Your Patron is a tinkerer or inventor, perhaps a champion of Gond, the god of crafting, or a world famous artificer who has retired from adventuring life. They are your in-world actual patron, they provide you with all the cool things that explains your Warlock abilities. Your patron may have made a deal with you to be a test subject for their experimental creations, or perhaps fulfilling a task or quest that they did not have the courage do themselves. Whatever your origins you are a wielder of tools. Similar to an artificer your magic is expressed through inventions and crafted items. The spells and invocations you gain are provided to you by the inventions your patron has given you and would likely have more mechanical or alchemical causation than arcane.
Examples of patrons may include- Evani of Waterdeep, Noanar of Netheril, Hank Pimm, Hephaestus, Doctor Brown, or a Grandmaster Crafter of Moradin or Gond.
- from the publisher's blurb