Aestilon

During downtime, the players can invest some time in various activities. Players can work on their immediate future, or start preparing for a furtherfuture. You can set things in motion for later in the campaign.

To be filled with better rules than 5e base, but you can essentially invest time in crafting, including the crafting of magical weapons. Obviously, as adventurers yourself, crafting isn't a thing you spend time on yourself, you will enlist professional craftsmen to do so.

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