I've done a lot of searching on this topic and I've been unable to find any information.

I've noticed that errata on Iron Discipline clearly states that it does work on fellow party members as long as you are considered the party leader.

Into the Jaws of Hell has Iron Discipline as a prerequisite plus it is also worded nearly identically with the added benefit of immunity.

So the real question is... Does the errata define what a "minion" is or does the errata specifically increase the usefulness Iron Discipline and leave Into the Jaws of Hell unaffected?

If it defines what a minion is, then Into the Jaws of Hell should work on my party members. If it expands Iron Discipline, then Into the Jaws of Hell would still only effect NPCs.

If you are clearly seen as the leader by the other party members i would let it work on them, too. I think this is clearly the intention of the talent, even if the wording isa bit unexact.

Party members is just another term for minions, if you're the leader..

That's how I rule it anyway.

In short, I agree 100% with Noctus!

I've sent this question to the Devs.

I'll make sure to let you guys know what there answer is.

Here is the response.

It doesn't really define what a Minion is, it's up to your GM to interpret what is right for his story. As it's a protection to the party, in my games I allow it to work on players. I don't allow that same player to issue orders with the Command Skill, but I do allow the player to use Command to inspire his comrades. It's really a matter of party temperament.

Mack Martin
Associate RPG Producer

So it still is a bit vague, but it seems that it is certainly a viable ruling to have it affect PC allies. Though it seems that it is highly GM dependent.