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Questions about Shards, vessels, the metallic arts
I wanted to ask everything in one post instead of multiple, so I divide this one.
Shards and Vessels
It's known that a Shard's Intent eventually overpowers the agency of the vessel. It's mentioned in the Stormlight epigraphs that Ati, the vessel of Ruin, was once a kind man.
I've been wondering about this process. Does the amount of time it takes for the vessel to lose agency depend on the shard and the vessel? For example:
- If the new vessel is already a sliver of the same shard, will they lose agency faster?
- If the new vessel is already a sliver of a shard with opposing intent, will they lose agency slower?
- If a vessel (as in the case of Sazed) holds two shards with opposing intents, are they able to maintain their personality forever, the different intents "cancelling out"?
- Do shards that seek change (Ruin, Endowment, Cultivation) in the most general way influence their vessel faster than the more passive intents (Preservation, Honor) who want to maintain?
Do the 16 sh

Can Feruchemists use other Investiture?
Let's assume a Feruchemist has access to some other form of Investiture, maybe with a Perpendicularity, liquid Dor, becoming a Radiant, getting Breaths, or maybe even tapping Connection to become Elantrian or something. We've seen from TLM that Allomancers can use Investiture from a Perpendicularity instead of metals, so can Feruchemists do the same? If so, how would something like a coppermind work, where the attribute has data stored rather than just an amount? There's probably a WoB explaining this somewhere, but I can't find it.