I find that having Crafting at level 5 and just adding Tenebrium damage to existing weapons benefits me more.
The Scientist Talent increases both Crafting and Blacksmithing by +1. Below is a list of all craftable Weapons in Divinity: Original Sin 2, along with their Recipes.Weapon damage will scale with your current level. The former is undoubtedly useful (even for a bow) but I've never needed more than Tenebrium 3 to get the best result out of it. If your crafting/blacksmithing level is not high enough, a message is going to appear over the head of the crafter, so make sure that this isn't being blocked by something like the inventory screen.
This does not affect the attribute / skill / resistance bonus of crated items, but only their damage + defense rating as well as their price.
