I’ve got a rules question for Band of Blades.

I’ve got a rules question for Band of Blades.

I’ve got a rules question for Band of Blades.

A number of the Broken Abilities have the effect of allowing specific Elites to show up in any mission. This suggests to me that there exist some rules that normally regulate how often any Elites can show up, but I can’t find it anywhere.

Am I just missing these rules, or are they not there?