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So does Aluminum have no limit to how much Invesititure it can block or is it possible to overwhelm it's Investiture-blocking properties with enough Invesituture? Like if you were wearing a full set of Aluminum Armor, would a Shard be unable to Smite you with an Invested Lightning Bolt?

So, a question's been bugging me for a while about feruchemy. We know that you can't store all you have of a quality at once; a Brute can't store so much strength at a time that, say, they're physically incapable of moving, or their diaphragm can't pump their lungs. My question is, does that limit stay the same if your total quantity of that quality increases, or does it move? As an example, say our hypothetical feruchemist has 4 units of strength (just an arbitrary measure), and she can store two of those at any given moment, bringing her down to 2 units in the meantime (she's weak, she's unable to do too much etc). If she were to train her body to increase her overall strength, got absolutely ripped and ended up with 6 units of strength, would her limit for the amount she can store at a given time still be 2 (so she can store an equal amount of strength to before about twice as fast) or 3 (so she can store it only about half again as fast, but is only very slightly weaker than she was when she wasn't storing before she did her training). If the limit is essentially a safety measure, like how Rosharan stoneshaping was deliberately limited so it wasn't as dangerous as Yolen microkinesis, it would make sense for the former to be the case. There's at least one other example of a similar thing in feruchemy, in how firesouls are more resistant to the effects of tapping heat; they can't just boil themselves alive unless they're compounding. On the other hand, the 'low bound' of storing might be something more to do with the Cognitive self-image or the Spiritual self; something like feruchemy only being able to 'deviate' from that self a certain amount (though that might imply that storing Identity might let you lower the bound). I hope the question's clear. Don't know if anyone has any answers, but at the very least I hope we can have some fun discussing the thing!

I was recently reading a bit about Old Magic in Roshar on the Coppermind Wiki. I was thinking about Boons and how they operate. When a person gains a Boon, can it be anything they want, like gaining the ability to control electricity or reality, or are there specific limitations on what kinds of things can be gained through Old Magic? Can I get the ability of one of the forms of the Singers or even become an Allomancer on Roshar with a Boon?