The beast-destroying great sword in "Metaphorical Fantasy: ReFantazio" is a very useful and powerful equipment in the game. If you want to get this beast-destroying great sword, you can explore the ancient well dead end during the day on July 8, and then go to the Decay Just put water into water channel 4 and enter a specific area to fight the Mimics.
How to get the metaphorical fantasy beast-destroying sword
July 8th, during the day, explore the dead end of the ancient well and the decayed water channel 04/04. Release the water from the left. Treasure box 1 in the north of the map contains the Speed Suit.
On the right side, put the water on the upper layer first, then lower the layer, and finally drain the water. The treasure box 2 on the bottom layer is a Mimic. Kill it to get the Beast-Destroying Sword.