[@Incanus] Your ideas for the stone sound fair to me! Perhaps once the RP starts rolling we'll have a better idea of how best to proceed. It may come up in the plot.

As for an herblore reference, I can't fathom any reason it wouldn't be automatically approved. Unless anyone has objections, just go ahead and post that in the Characters tab, and continuously add to it if you like.

If Mat has any of these herbs or potions on his person at the beginning, just note that in his CS. Otherwise, just go for it and go nuts. :)