The Floor is Lava

The Floor is Lava was a virtual representation of one of Kassandra's genetic memories, relived by Layla Hassan through the portable Animus HR-8.5.

Riddle
''Rumors are erupting that a precious relic was sent to be destroyed at the Foundry of Hephaistos. Dive down the throat of the volcano and be mindful of your footing. Some have been scorched trying to recover me.''

Outcome
Kassandra found and recovered the treasure.

Reference

 * Assassin's Creed: Odyssey