There exists, in some forgotten thrift store, two coins. The shopkeeper knows not their true value and will happily give it away for a pittance.
“Become What You Seek”: This gold coin, with its title inscribed on the surface, has a light mental enchantment on it, making those who take it want to keep it on their person at all times. That is nothing, however, compared to its true purpose. While having the coin with them, the users' choices become something more: at moments that go against the way they normally act, they will physically and mentally transform to fit their action. The user will remember who they used to be, but as the actions stack up and the changes continue, users tend to prefer what they've become to what they were. However, at no point does reality change to fit their forms, with the exception of clothing changes.
“Shape What You Were”: This silver coin, also with its title inscribed, has none of the mental compulsions of its sibling. Instead, were one to hold it and concentrate on a different way of living, something they could have done that they didn't, or any other kind of other life, reality will reshape to fit the wish. The user and those watching the change will keep their memories of the previous reality, but all others will never know how things once were. The person changed, usually physically and mentally, will over time begin to identify more and more with their new world and see their true past as more and more of a dream, knowing it was real but feeling distant from it.