Likewise, it would be weird to be running a fairly traditional fantasy campaign and suddenly throw in laser guns and force fields. So that means that Chaositech isn't designed for traditional fantasy campaigns, right?
No. That's not the way it's been designed. See, chaositech isn't technology. You don't look at this stuff and think Star Trek. It's meant to fit into a fantasy milieu. How? Well, it will pass as magic as easily as it will pass for technology, for it truly is neither. You'll find no discussion of scientific terms or physics applications in the description of chaositech abilities. You will find discussions on chaositech cults, the dread worship of chaos gods, chaotic spells, and how chaositech interacts with magic.
Chaositech is weird fantasy, but it is fantasy. The material within is designed to work in a standard D&D style fantasy campaign. It's how I used it (and continue to use it) in my own campaign.
In fact, because Chaositech was designed for fantasy games, it wouldn't fit well into a straight-up, hard science fiction game. It's too strange -- too supernatural seeming. It's got more in common with Dr. Frankenstein and his monster than with real science.
So, it's not my intention to change your campaign paradigm with chaositech. It will change it no more drastically than a new book of spells or magic items. Yet at the same time, it will introduce some new flavor and new threats the likes of which you probably (hopefully) have never seen. Here is an excerpt from the book to show you some ways you can bring chaositech into your game.
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CHAOSITECH VS. REAL SCIENCE
One great way to introduce chaositech into a campaign is to do so alongside developments of real technology. If you've got dwarves that use steam-powered technology or the occasional firearm, or use "steampunk" technology in your game at all, this is a wonderful chaositech "hook." Because now you can offer up both, as equals but opposites. Chaositech, obviously, is the creation of chaos, and normal technology is the stuff of law. Gods of chaos (the Galchutt) support one, while the gods of law support the other—it's an arms race fueled by religion. The two forces can clash on a spiritual, philosophical, metaphysical, and physical level, and the PCs can choose which to support.
In particular, this option works well with the "tools of the ancient gods" approach, for it creates antoher way in which chaositech differs from conventional technology. While steampowered devices are new, chaositech is old: Chaositech isn't an innovation, it's an artifact.