Oblivion Lethe

Oblivion Lethe (オブリビオンのレーデ Oburibion no Rēde) was a dryad. She was a formless entity that could possess human bodies. She possessed the dead body of Maria, the dead sister of Southern Crown Katya and renomimated herself as Oblivion Maria  (忘却 の マ リ ア Oburibion ​​no Maria). She fought against Katya inside the Eden Garden and the shantia managed to defeat the dryad and purified the soul of her sister and later the Southern Crown Shantia killed her with the help of the soul of Maria.