I guess the perfect system would take these things into account:
- the number of days resting = earning points for creation.
- the difficulty of items crafted = higher scroll levels require more points.
- a mechanic that prevents exploiting (e.g. if they want to craft 10 scrolls of bless while resting, because it is only a level 1 spell).
Does anybody have an idea about that? Or would you simple say: If you are there, roll 1D4 and that's it?
In addition: What's about availability of scrolls/potions at other vendors (in towns)? How would you rule that?
Would be really glad! Thanks in advance!
Peter
If I could offer an alternative suggestion:
Perhaps just a single employee, or small group, using the rules for the Artificer Wizard subclass in the Eberron Unearthed Arcana.
They can make both potions and scrolls, including healing potions. However, these potions are created by use of spell slots which can't be regained until the potion is used. Thus the supply is limited, and they can't be stockpiled.
Likewise the scrolls have a similar limit due to how they are created, and they need to be scrolls that the artificer knows.
Let the Artificer level up as the party does/when you think it appropriate, so the amount and power of potions and scrolls available to the party increases.
Perhaps let the party specify one out of the two spells the artificer will learn when he levels. If they want scrolls of spells that he doesn't know, they will need to use their own resources to teach him that spell.
You could even give him a limp, a lisp, proficiency in Medicine, an obnoxiously subservient attitude, and call him Igor.