Artifacts. Do It Yourself. (a tutorial for Academy players)

Avenger, without loyalty, machines cannot experience empathy. And with it, golems and gargoyles have combat prowess.

It very well could be, these are two adjacent branches of diplomacy. And loyalty gives morale to machines and golems, but not to gargoyles. (at least, that's how it is in the skill tree, and I haven't played as a mage in a while, but it seems to be exactly that way).