Scion boils any craft project down to a goal with a Tier. The goal is the aim of the crafter's work, and usually amounts to creating an Enhancement or resolving a Complication, such as preparing a lavish feast to impress a delegation of giants.
The Tier is based on the goal's scope, and determines how hard it is to achieve. Tier 2+ projects (and some large Tier 1 projects) are complex challenges that require a suitable Path, such as Student of Kagutsuchi. These projects have a number of Milestones equal to their Tier, plus one for every key element (materials, tools, design) that is missing when the project starts.
Possible Milestones for making a Relic include:
Acquire rare materials, such as mythical herbs, secret ores, or the hide of a titanic lion. Characters might do so through violence, bartering, exploration, or alchemy.
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Uncover a recipe or secret technique, or gain inspiration from a similar item or phenomenon. Suitable methods include theft, apprenticeship, research, or trade.
Earn the blessing, advice, or hands-on assistance of a God or other powerful creature suited to the Relic.
Perform a ritual act, like blooding a blade in the heart of a giant, parading divine armor through a grand ceremony, or spiritually cleansing oneself before work begins.
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These Milestones have a minimum Difficulty equal to the overall Tier of the project, but remember that intervals don't need to be resolved with a roll. If Diarmuid's new spear needs the tusk of a demon boar, the players can spend an episode hunting one down to achieve that Milestone. Or if they've already slain such a beast, the crafter might produce a preserved tusk, translating the achievements of an earlier adventure into a "free" Milestone for this project.
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A crafting project does not force the story to a halt while one character sits at an anvil. Characters pick up inspiration, acquire reagents, and win favors through their stories, allowing Heracles to sew his Nemean Cloak from the spoils of adventure.
Even when an artisan spends time in her workshop, other characters in the band can get involved in achieving Milestones by exploiting their Paths, taking on suitable challenges themselves, or offering support using the teamwork rules. Those intervals that require nothing but long and solitary work should occupy the downtime between scenes, episodes, or even arcs; while others train, plan, or party, the crafter toils away.