The Elpha is a trans-human version of an Elf, in a way hyper-evolved beyond the elven norm.

Elpha's develop first as elves, and go through a transformation later in life to reveal their Elpha identity, treating their time as an elf as a sort of larval stadium. Becoming an Elpha is genetic, but additionally requires magical energies which makes the exact moment of the change unpredictable.