Etherium Heart's Origin

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Listening to her doubt, Aurora smiled. "That was something the Great Mother gave out on her own. That cavity… was where the Etherium Heart used to be."

Evelyn blinked.

This wasn't the first time she was hearing the name of this object.

The first time Aurora mentioned it wasn't a pleasant memory, but Evelyn still clearly recalled that her teacher seemed to intend handing this 'Etherium Heart' to her as an inheritance.

At that time, she had vehemently refused, since there was no way she could accept losing Aurora. 

With her teacher's attitude, there was no way to be sure if she was really planning on giving up on life after she was done 'taking care' of herself, and Evelyn didn't dare to take any chances.

Later, when they were just entering the grand vault, Aurora also mentioned that the Etherium Heart was the key through which the vault was unlocked, and Evelyn couldn't help but make a vague guess in her heart.