Definitions by TFGOT
Eliker
A woman who knows how to use Elika (i.e. a woman who can do everything including flying, self-cloning, shapeshifting et cetera)
Elizabeth Olsen is a very good Eliker from the looks of it, probably even better than the character she plays
Elika
A special kind of energy used by certain women to perform various supernatural feats such as dupliaction, flight, shapeshifting etcetera