So, most people should AVOID the fae.
Grave dirt, cold iron, evil eye, knock on wood.
I'm not entirely sure what I am though. I'm pretty sure the mother who raised me, my mom, made a deal for a baby; for a time I was separated from my siblings.
There's a weird narrative cloud over my appearance and it has all the stink of "changeling". There are a lot of people who might be like "ooh~ faaaaaairies" or some stupid as fuck shit like that.
Yeah. Fuckin fairies...
I had a fae dream a few years ago.
I woke up in the middle of a genocide against faeries and I as a wizard joined them to stop the genocide. I'm pretty sure they got to me through Carnival Row...
But at any rate, there it was and I was doing the right thing. There were some casualties, and they were painful.
One thing leads to another and she (Titania, queen general of Fae resistance) is punishing me and one other by making us hold something odious given to us by her in our mouths.
Wanting to humiliate her as much as she tried to humiliate me, I swallowed what she gave me.
I fougt for her, saved some lives, she gave me a drink, the end right?
LOLNO!
There's the story of my staff, too. That one is a... Well, there's balance there too.
And then one of the events in the shared dream a faerie queen tries to appear in a context wherein knowledge I held could be pursued through my links.
The thing is, I don't rightly know how much of a narrative tether links me and her. I know it's going to come up again.
More than ever, Fae act with the intent to be "part of the narrative" and held "true to character". It is their nature to seek to have stories told of them, and the stories define part of what is their nature for when the stories are heard by the people, the people give birth to them through belief.
Much like demons, various fae can be temperamental and even dangerous. It's one thing to hear the story, it's another to dream a faerie dream, and yet another still to do stupid things as regards obligation.
If one MUST interact cordially with the Fae, and you do not want to encourage knives in your back as it were, it is in my experience recommended that you do not do any thing that does not itself create balance, and do not attempt to negotiate to achieve balance.
Faeries very much resent humans BECAUSE OF A DEAL. A contract was... I don't even know the full story of what happened, and the one view I have on it involves a rabbit and that it worked out very badly for the rabbit, and now contracts are the shape of their funnel, their weapon by which to consume humans.
So don't do faerie deals please. They're just bad for everyone.
If you absolutely must do something that could be construed to indebt a faerie to you, see to it that the course of action sees due balance without words or arrangement.
Expectation kills some magic. Expectation when mixed with other magic can get you killed. Faeries love it oftentimes when they manage to kill off the subject of the story that encodes them and carries them forward in an ironic way, and they save this for those who expect of them.
A clever exchange of balance engenders respect, as far as I can tell.
YMMV.
As to "cold iron", best I have figured is "cold" refers as much to emotional state and "iron" is more a reference to weaponry than Fe.
Combination of "iron" "weapon" and "calculated use" seems to be the key to cold iron but I communicate this so as to say "these are things that bring disrespect and start leverage games."
One last time, TL;DR:
Don't play the leverage game with faeries. It's a bad end.