Before taking on this task, you'll first have to collect 100 Gold Bars, as you'll need them to unlock the case that holds the chalice. Thanks to Aura's help, you'll be given the hint that the Chalice of Cubetastrophe is where the “Anvil Square once stood." You'll then want to navigate to the location of the magnifying glass on your map. This is where the chalice is hiding.

You'll want to walk into the lower portion of the Hidden Ruins you'll find at this location. Right when you walk into the temple, turn to the wall at your left and begin breaking it with your melee weapon. Just be sure to be mindful of enemies while you're trying to get into the hidden room, as they can still attack you as you're breaking down the wall.

Once you've broken through, turn to the right and follow the path until you reach a room at the end. Here, you'll trade 100 Gold Bars to open the tomb that is holding the chalice.

Retrieve the Chalice of Cubetastrophe and bring it back to Aura. You'll be granted 20,000 XP just for finding the chalice's hidden location, so though you'll have to trade 100 Gold Bars to complete this mission, you'll be rewarded favorably with XP that will help you work your way through this season's battle pass.