(M&M 3e) Source of "Hide Minions" Extra for Summon?

[Duggan]

So, a player put this Extra on their character, stating that it's in Herolab (which it is) but I can't find any reference to which book it comes from.

The text of the Extra:

This extra hides your summoned minions. This is useful for heroes who summon many identical minions, or summon minions of a broad type. At rank 1, only one minion will be displayed. Rank 2 will hide all summoned minons.

It's not tagged with any Source book, and my scans through the books noted as being included in Herolab, as well as a grep through my PDF copies, has found not matches. Did Lone Wolf make this one up?