NCF – Extended list of Neutral creatures.

By the way, some creatures (like cadavers) are available in the Fortress. That is, they are like second alt-upgrades. Is this a bug, or is it intentional?

There is a mod on the English website that gives each creature an additional alt-upgrade, and it can appear in non-upgraded units.

Added 2 minutes later
I have a question: how do I give a creature runes so that it can use them even if the hero doesn't know how to craft them?