Aberforth,
AD has asked me to write to you in an attempt to explain his latest plan. I can't reveal too much right now, but let's just say that your brother's organisation is more far-sighted than most, including my own, small and fringe as it is. They knew this war would involve all of us at some point- normals and magicals alike.
"We need... an advantage" - your brother's words were nothing short of prophetic.
That advantage came from an unexpected direction. Me. I'm their ace in the hole. The Potter kid may be the one to finish all this, but I'm here in the thick of it too.
After all, who'd be expecting it?
Who'd be expecting a muggle Auror?
My superiors, such as they were, may think I've vanished off the map. That's not quite true. I'm still on it. I'm just playing within new boundaries, that's all.
As I said before, the minds of the enemy are closed. All this wand-waving is useless to me, so when I was asked to help, I did so on my own terms, as he intended. Albus keeps my equipment safe, apart from one little item.
They won't see it coming. Literally. I'm a ghost, Aberforth, in every sense of the word.
This is where I need your help. I have certain items that I need... enchanted for them to be able to work right in this environment. My normal equipment is not affected, but both packages are, as is the other item we spoke of. The original owner has let me borrow it for a while, and, once fully activated, may well come in handy, even though it's not quite my style.
Albus has no doubt by now asked you to perform some unusual charms on me. They'll be necessary, as some of my standard equipment is unable to be charmed to work in this environment. You'll find out why soon enough.
The potion that Severus provided seems to have had its effect. I won't be leaving you any time soon. The research he's done will be invaluable for countering the effects of EnTerr project. The man is a useful if slightly disturbing ally. It took Hunter years to learn the ideas behind it. He's done it in a few months.
I will be on my way as you read this. I'm bringing a friend – I think the two of you will get along quite well. My items will arrive by portkey – I'll need you to unshrink them when they do. We'll discuss any other modifications after my arrival.
Regards,
David.