Items of historical significance and of magical potency

As an item from another world, I introduced an atlas map of Mars, of Martian make. I intended it as a hint or reminder that other planets are available for visiting and having adventures on, but the players' first thought was to just sell the map to a collector for more treasure, and he immediately acted on it.

That sounds exciting! (But hopefully not an *entirely* missed opportunity... I'd seriously consider some "strings attached" in this instance, if it makes sense with the rest of your world-building.)

(Also, I can't answer your questions regarding the Grimoire, but I think your use of "doses" when it comes to a potion is a very clever solution, and could work for all kinds of limited magic.)

That sounds exciting! (But hopefully not an *entirely* missed opportunity... I'd seriously consider some "strings attached" in this instance, if it makes sense with the rest of your world-building.)

Well, it was an opportunity to arrange a second meeting with a certain interesting NPC who, off the top of my head, made sense as one of the possible buyers for such a rarity. There might be a number of potential side-effects to this meaning, but I don't want to plan too much in advance.