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Having re-read both Mistborn and White Sand in close proximity, I’ve developed a theory. Although this theory mainly relates to the use of Bendalloy Compounding and Sand Mastery conjunctively, it could be expanded upon to include other topics of how the two most prominent Scadrian magic systems interact with Sand Mastery. Anyways, introduction out of the way, I’ll try to explain how to hack Sand Mastery via Compounding. First of all, I’ll try to explain Sand Mastery. At least, from how I understand it from reading the comics and researching on the Coppermind. Sand Mastery is an end negative result magic, maybe. To use this form of Investiture it requires both water from the body, and the presence of Kinetic Investiture. After using the sand however, the Sand Master becomes dehydrated, and the Kinetic Investiture stored in the sand is lost, meaning not only can the Sand Master risk death, but the sand itself has less Investiture than before. Next, I’ll explain Bendalloy. I’m sure we are all well aware of how it works Allomantically. A Bendalloy Misting creates a bubble of sped up time, quite simple. Though, Feruchemical Bendalloy is interesting in my opinion. A Ferring would be able to store both calories, and hydration, albeit in separate metal minds. So, if one compounded Bendalloy they would no longer need to eat or drink, as their metal minds would be able to sustain their need for calories and water. Now, we reach the cusp of my theory of how to achieve unlimited Sand Mastery. As we’ve already established, to use Sand Mastery, one must be hydrated. Though, if a Sand Master has the ability to Compound Hydration in a Bendalloy Metalmind, they would theoretically be able to fuel their Sand Mastery directly from that Metal Mind. This could lead to some interesting effects. For instance, we know a Feruchemist can draw out their stored attributes at different rates, so if a Bendalloy Twinborn Sand Master drew upon their hydration-mind, how would that affect their Sand Mastery, if it would affect it at all? Would they be able to control more ribbons? Or would it simply just affect the strength of their pre-existing ones? The real main benefit of this, however, is that a Sand Master who is also a Bendalloy Compounder would be able to endlessly Sand Master, as long as there is Invested Sand for them to manipulate. This leads me to the next part of my theory. As stated before, the Sand on the Dayside of Taldain is charged via exposure to Kinetic Investiture. In most cases this is in the form of the Sun of Taldain, though it has been stated that other forms of Kinetic Investiture would be able to fill that role, such as the Rosharan Highstorms, giving use to Sand Mastery across the Cosmere. This is one of the more uncertain parts of this theory, but by this principle, would the Kinetic Investiture released by Allomancy, in this case, Bendalloy Speed Bubble, be enough to recharge Taldainian Sand? If this is the case, the it appears that a Bendalloy Compounder would make the ultimate Sand Master. They would be able to limitlessly Sand Master via the use of Compounding hydration and recharge the Sand they expend via burning Bendalloy. Obviously this is only speculation, as we don’t know if the Kinetic Investiture of a Bendalloy bubble would be enough to re-Invest the Sand as the Sun or a Highstorm would, but I think there is some merit to this theory.