I do not believe there are any 5e rules for this, so this is as much asking for potential houserules as anything else. If there is an official rule somewhere, by all means, please point it out.
Let's say a PC is in a dungeon and would like to craft some kind of explosive arrows by rigging an arrow with various materials, right then and there. It's not a matter of using the 5e Basic Rules for crafting, because it's quick and dirty and he does not need a whole day to do it.
What kind of skill rolls would be involved in this?
Or are there any skills? Should it just be untrained stat checks? If so, how many and what kind?
Update: Specifically, I'm interested in which skill(s) or stat(s) would apply. Or perhaps an additional skill is house-ruled in for this purpose. The type of crafting is essentially akin to what a Tinker Gnome would do, cobbling together things to create something greater than the sum of its parts, but without that ill-fated race's somewhat… dramatic results. A DC would be determined per the difficulty of the item being created. Perhaps success or failure on various rules results in different degrees of success or failure.
Or am I completely overthinking this?
Best Answer
I think SevenSidedDie's response covers the basics pretty well.
On the specific question asked, if I where the GM, my ruling for this action would be (I am considering L1-4 characters):
Aside from following the mental process described by SevenSidedDice, I made these specific choices along the path: