There is nothing else known about Mercuria although she is believed to have been lurking beneath the waters of Beroiah or the seas nearby.
Mercuria neither appeared nor mentioned in the story of the game.
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- Mercuria is presumed to be a monster from Beroiah due to that she was among the contents in the game files labeled with SeaPort which belonged to the said dungeon.
- Rather than having octopus parts, Mercuria seems to be wearing them instead leading to the conclusion that she may not be a Fishman like the character Hekar.