Thats the thing, I don't know whether Astral actually has it or not, it seems he was supposed to have it, but its never been clearly stated. I guess I could have that guy overrun, but what if Grim returns and says that it contradicts what he laid out, then I'll be in some difficulty. Frankly Kap I am getting to the end of my tether, and I am beginning to lose respect for some of the more stringent rules simply due to being forced to twiddle my thumbs for weeks. I can understand Dawn's situation however- frankly I'd just like it if he kept us up to date on whats actually happening, and he is more separated from me due to the plot ties not being set up so its easier to work around his absence. 

Anyway, Grim will hopefully return soon, otherwise we'll probably have to enforce this part of the rules:

"we’ll try to work around your character in absence, but if you up and vanish, their life expectancy will decrease suddenly. It is surprising how often people die via stray arrows to the knee…"

Anyway, it may end up that that person who was supposed to deliver it has been killed, and the horn will fall into my possession regardless, but I'm gonna give Grim another week to just appear, otherwise its parcel delivery stallion mutilation time.