When you type “eisenhorn omnibus free digital audiobook free” into Google, you enter a legal gray zone. Here is the hard truth:

A deep, gravelly voice suddenly erupted from the datapad’s speaker, cutting through the sound of the rain. It was a voice of authority, of weary determination, a voice that had seen the abyss and refused to blink.

While not permanently free, Games Workshop partners with once or twice a year. Past bundles have included the entire Eisenhorn series plus Ravenor and Bequin for as little as $1 (minimum) or $15 for everything. This isn't "free," but $1 for 40+ hours of audiobooks is as close as you’ll get ethically.

As for a free digital audiobook, I found that there are some options available:

The Eisenhorn Omnibus is a comprehensive collection of three novels by Dan Abnett, a renowned author in the Warhammer 40,000 universe. The series follows the adventures of Inquisitor Gregor Eisenhorn, a brilliant and complex character with a rich history. The omnibus includes:

Even if you cancel the subscription before the 30 days are up, the digital audiobook remains in your library forever. 3. Spotify Premium