OK; this will hopefully be short and sweet. Quick note: I'm not assuming that alchemists prey on Prometheans. They certainly have incentive to do so; but the rules are intended to cover the ones who don't every bit as much the ones who do, and in fact do not assume that there's anything resembling a clear line between the two.
Distillations don't come naturally to alchemists the way they do to Prometheans. This manifests in two ways: first, the Alchemist must learn the Distillations of an Alembic in order, at a cost of three Experiences each. Second, every ability in the Alembic costs an additional point of Pyros to use. The Persistent effect of an Alembic is not persistent for alchemists: they must spend one Pyros per scene to activate it. Distillations that would cost a Promethean one Pyros to activate costs the Alchemist two; Distillations costing a Promethean two Pyros costs the Alchemist three; and Distillations that require a Promethean to spend three Pyros require the Alchemist to spend four.
Alchemists don't have Magnitude. On the downside, this means that they don't get any Supernatural Resistance bonus. On the upside, there are no caps on the number of Distillations they can learn. If there's a cap on how many Alembics an Alchemist can study, it's determined by his rank in Occult (which, for an Alchemist, represents his study of Alchemy).
They also can't generate or store Pyros within themselves. However, they can create Reagents: alchemically potent materials that are invested with Pyros. Doing so from scratch requires an alchemical laboratory and a day's worth of work, at which point the Alchemist makes an Intelligence + Occult roll to determine whether he successfully created one Pyros worth of Reagents. On an exceptional success, he generates multiple Pyros. If the Alchemist can find a source of Pyros (such as a Promethean or a Firestorm), he can attempt to harvest from it considerably faster than trying to generate Pyros from scratch. Harvesting Pyros from a Promethean requires Intelligence + Medicine, and one roll takes an hour (and inflicts damage to the Promethean in a manner similar to Lacunae). Harvesting Pyros from a Firestorm requires Wits + Occult and can be done once per scene. This is the most lucrative means of harvesting Pyros: each success harvests one Pyros. It's also the most dangerous method: you must expose yourself to a Firestorm.
An exceptional success when harvesting Pyros from a Promethean doesn't necessarily harvest multiple points of Pyros: if the Alchemist chooses, he can have the Promethean instead serve as a catalyst. The Alchemist generates a Pyros worth of Reagents, and the Promethean keeps its Pyros. Using a Promethean in this way is still painful for the Promethean (it still suffers damage), and it only keeps its Pyros if the Alchemist achieves an Exceptional Success; so there aren't many Prometheans who are willing to volunteer to serve as an alchemist's catalyst. But the option is there.
Reagents tend to go bad unless carefully preserved, which requires a storehouse. A storehouse is rated by how much Pyros-worth of Reagents it can store safely; excess Reagents risk triggering a Firestorm. Reagents not kept in a storehouse lose their potency in a day. An Alchemist can safely carry five points worth of Reagents on his person; more, if he has suitable gear (e.g., a satchel that serves as a sort of “mini-storehouse”: it won't keep the Reagents from going bad, but it can increase the amount that can be safely carried without risking a Firestorm). If a Firestorm breaks out, it consumes all Reagents in the area, save only for those Reagents created by harvesting the Firestorm. Storehouses and satchels are represented by Merits, rated according to how much Pyros they can contain.
Alchemists fuel their Distillations by releasing Pyros from their Reagents, which get mixed together with suitable preparations (which requires an Intelligence + Occult roll). Unlike a Promethean's Distillations, an alchemist's Distillations take place within the resulting mixtures rather than inside the person; as such, they affect whatever the mixture is applied to rather than affecting the Alchemist himself. In many cases, this is a distinction without a difference: Distillations that are designed to affect people or things other than oneself will generate their effect on whatever the mixture is applied to. But Distillations that are designed affect oneself likewise affect whoever the mixture is applied to. The mixture doesn't have to be applied to a subject immediately; it remains viable for a full day (or longer, if placed in a storehouse) just like Reagents. The choice between carrying Reagents and caring mixtures is a matter of flexibility vs. convenience: mixtures are ready to go right away, but the Distillations they represent have already been determined; Reagents can be used to mix together any Distillation that the Alchemist knows, but actions must be taken and rolls must be made in situations where the Alchemist might not be able to afford the time or effort.
A Promethean might also choose to study Alchemy. Doing so potentially gives him the best of both worlds: he can channel Pyros through his Alembics into a mixture with a successful Intelligence + Occult roll, although he pays the Alchemist cost to create the mixture: no freebies. He can supplement his Pyros with Reagents, and/or can expend Pyros to more rapidly create Reagents (although that involves some self-inflicted wounds) which he can then share of store.
I'll get to Vitriol next. The essentials are that alchemists cannot generate Vitriol; they must harvest it. And they use it to transform themselves, eliminating Conditions or gaining/improving traits. The specifics of what that means and how they do it are yet to be determined.
Thoughts?
Distillations don't come naturally to alchemists the way they do to Prometheans. This manifests in two ways: first, the Alchemist must learn the Distillations of an Alembic in order, at a cost of three Experiences each. Second, every ability in the Alembic costs an additional point of Pyros to use. The Persistent effect of an Alembic is not persistent for alchemists: they must spend one Pyros per scene to activate it. Distillations that would cost a Promethean one Pyros to activate costs the Alchemist two; Distillations costing a Promethean two Pyros costs the Alchemist three; and Distillations that require a Promethean to spend three Pyros require the Alchemist to spend four.
Alchemists don't have Magnitude. On the downside, this means that they don't get any Supernatural Resistance bonus. On the upside, there are no caps on the number of Distillations they can learn. If there's a cap on how many Alembics an Alchemist can study, it's determined by his rank in Occult (which, for an Alchemist, represents his study of Alchemy).
They also can't generate or store Pyros within themselves. However, they can create Reagents: alchemically potent materials that are invested with Pyros. Doing so from scratch requires an alchemical laboratory and a day's worth of work, at which point the Alchemist makes an Intelligence + Occult roll to determine whether he successfully created one Pyros worth of Reagents. On an exceptional success, he generates multiple Pyros. If the Alchemist can find a source of Pyros (such as a Promethean or a Firestorm), he can attempt to harvest from it considerably faster than trying to generate Pyros from scratch. Harvesting Pyros from a Promethean requires Intelligence + Medicine, and one roll takes an hour (and inflicts damage to the Promethean in a manner similar to Lacunae). Harvesting Pyros from a Firestorm requires Wits + Occult and can be done once per scene. This is the most lucrative means of harvesting Pyros: each success harvests one Pyros. It's also the most dangerous method: you must expose yourself to a Firestorm.
An exceptional success when harvesting Pyros from a Promethean doesn't necessarily harvest multiple points of Pyros: if the Alchemist chooses, he can have the Promethean instead serve as a catalyst. The Alchemist generates a Pyros worth of Reagents, and the Promethean keeps its Pyros. Using a Promethean in this way is still painful for the Promethean (it still suffers damage), and it only keeps its Pyros if the Alchemist achieves an Exceptional Success; so there aren't many Prometheans who are willing to volunteer to serve as an alchemist's catalyst. But the option is there.
Reagents tend to go bad unless carefully preserved, which requires a storehouse. A storehouse is rated by how much Pyros-worth of Reagents it can store safely; excess Reagents risk triggering a Firestorm. Reagents not kept in a storehouse lose their potency in a day. An Alchemist can safely carry five points worth of Reagents on his person; more, if he has suitable gear (e.g., a satchel that serves as a sort of “mini-storehouse”: it won't keep the Reagents from going bad, but it can increase the amount that can be safely carried without risking a Firestorm). If a Firestorm breaks out, it consumes all Reagents in the area, save only for those Reagents created by harvesting the Firestorm. Storehouses and satchels are represented by Merits, rated according to how much Pyros they can contain.
Alchemists fuel their Distillations by releasing Pyros from their Reagents, which get mixed together with suitable preparations (which requires an Intelligence + Occult roll). Unlike a Promethean's Distillations, an alchemist's Distillations take place within the resulting mixtures rather than inside the person; as such, they affect whatever the mixture is applied to rather than affecting the Alchemist himself. In many cases, this is a distinction without a difference: Distillations that are designed to affect people or things other than oneself will generate their effect on whatever the mixture is applied to. But Distillations that are designed affect oneself likewise affect whoever the mixture is applied to. The mixture doesn't have to be applied to a subject immediately; it remains viable for a full day (or longer, if placed in a storehouse) just like Reagents. The choice between carrying Reagents and caring mixtures is a matter of flexibility vs. convenience: mixtures are ready to go right away, but the Distillations they represent have already been determined; Reagents can be used to mix together any Distillation that the Alchemist knows, but actions must be taken and rolls must be made in situations where the Alchemist might not be able to afford the time or effort.
A Promethean might also choose to study Alchemy. Doing so potentially gives him the best of both worlds: he can channel Pyros through his Alembics into a mixture with a successful Intelligence + Occult roll, although he pays the Alchemist cost to create the mixture: no freebies. He can supplement his Pyros with Reagents, and/or can expend Pyros to more rapidly create Reagents (although that involves some self-inflicted wounds) which he can then share of store.
I'll get to Vitriol next. The essentials are that alchemists cannot generate Vitriol; they must harvest it. And they use it to transform themselves, eliminating Conditions or gaining/improving traits. The specifics of what that means and how they do it are yet to be determined.
Thoughts?
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