'Hmmm. I was expecting a man. Oh well, in this day and age it pays to be equal opportunity. Hello girlie. By being the first one to have the mind to pick up and put on this amulet, fate has chosen you to have it as its master. This is the pendant of Coyote The Trickster, the pendant of transformation.
Only you can command the pendant.
You may declare any transformation of your choice.
Any transformation you make retroactive becomes reality, no exceptions.
Only you retain memories of how the world was.
You can NOT make any transformation that directly contradicts a previous one YOU made.
You can not kill someone or bring them back from the dead via a transformation. (Undead are outside the realm of life and death and can not be killed or resurrected by a transformation).
You can not turn someone into an undead.
You can not make someone fall in love, if you rewrite reality so two people are married, it'll be up to them if they find happiness or not.
Statues and other works of art, or artificial life like robots, do not count as 'dead' since they have a life of their own.
The pendant is yours until you die or give it up or give to someone else, at which point your memories will change to having all the changes you've made to reality being natural. No exceptions. You CAN NOT reclaim the amulet once it is no longer yours. No exceptions.
You make pick only one other person or being to remember with you, their memories of the old world will vanish when yours do. You may not change which person once you have selected, even if that person dies.
They can not control the amulet, only you can.
How much you change the world, or not change the world? That's up your girlie. Enjoy yourself.
Cast in the name of the gods, ye not guilty.'