The PHB lists many sets of tools and supplies for several crafts and trades:
- Alchemist’s supplies 50 gp 8 lb.
- Brewer’s supplies 20 gp 9 lb.
- …
- Smith’s tools 20 gp 8 lb.
- Tinker’s tools 50 gp 10 lb.
- Weaver’s tools 1 gp 5 lb.
Some of those are pretty self-explanatory. Woodcarver, leatherworker, mason, those are all regular professions from real life. However, what are the exact uses of Alchemist's Supplies and Tinker’s Tools?
I've read that Alchemy can be used to make Healing Potions, but Alchemy is used by Wizards to turn wood into metal and things like that. The gnome's tinker can create Clockwork Toy, Fire Starter, Music Box, and is that all?
What if some of players ask to build a bomb with a tinker's kit? Or turn a rock into gold with Alchemy? Can anyone provide a concise explanation of how these two specific sets of tools are used in D&D?
Best Answer
There are great new rules for these — and all the tool proficiencies — in the Dungeon Master's Tools chapter of Xanathar's Guide to Everything.
For each tool, these things are given:
The Alchemist's Supplies can be used to give additional information in some Arcana and Investigation checks. They can also be used in Alchemical Crafting to make "alchemical items", of which there is a short list: a dose of acid, alchemist’s fire, antitoxin, oil, perfume, or soap.
The sample DCs are given for activities ranging from "create a puff of thick smoke" or "identify a poison" (both 10) to "Neutralize acid" (20).
Tinker's Tools can let you determine the age and origin of an object with a History check, or find how an object was damaged through Investigation. You can also repair damaged objects, at a rate of 10 hit points per hour of work (provided you have the appropriate raw materials).
The things you list (turn rock into gold or build a bomb) seem out of the power range of the various options explicitly listed, but they seem reasonable to attempt — if you set the DC appropriately high and the right raw materials are available and a reasonable amount of time is taken. Turning rock into gold might consume quite a bit of other valuable ingredients — or it might just take time. Under "Downtime Revisited" in the same chapter, there's this section on "Work":
So, you can use either of these tools to make money. You could just describe the Intelligence (Alchemist's Supplies) check as literally making money.