Maryoku Kare no Dark Elf

Amira was once a powerful figure in the world of magic. Hailed as the "omnipotent caster," she used her mighty abilities to illuminate the world, and eventually, she hit her magical limit and exhausted her powers completely. As her abilities begin to fade, Amira must face a reality where she exists as just a normal dark elf. Rather than falling into a pit of self-despair at her loss, she's looking forward to her new life and enjoying the world without magic. But after a life of adventure and wielding such power... can a quiet, peaceful life be enough?

(Source: Seven Seas)