Psymorii is a coined word that splits into three parts. Psy- comes from the Greek psychē, meaning mind or soul. -mor- comes from moira, the Greek word for a person's allotted share of the world, and so for their fate. -ii is a Latin-style plural ending meaning "those who." Put together, the psymorii are those whose fate is decided by the mind. Because moira first meant the share of reality a person is handed, the word quietly changes who does the handing: the mind, rather than an outside power, decides what each person gets. If the mind decides your share, your share can change whenever the mind does, and something that can be reshaped this way is malleable. Reading -mor- instead as morph-, "form," arrives at the same place more directly: the world takes its shape from the mind, so reality is malleable.