Myla

A happy little miner, mining for treasure near the entrance to Crystal Peak.

When first met, she's mining and gleefully singing, hoping that the player would come visit her again later.

Once the player has acquired Vengeful Spirit, her dialogue changes, then later once the Soul Master is defeated, she will have lost her cheerful tone and seem rather lethargic or confused.

After obtaining the Crystal Heart, Myla turns into a mindless husk and becomes hostile.