Upon Typhon's Crown

Upon Typhon's Crown was a virtual representation of one of Kassandra's genetic memories, relived by Layla Hassan through the portable Animus HR-8.5.

Riddle
''Stand atop where leaders dwell and you will see my isle. Typhon's Revenge is where I am - come visit for a while. Scale the mountain forged of fire, for at its peak I sit. But fear the smog and doom and heat, for they will test your gift.''

Outcome
Kassandra found and recovered the treasure.

Reference

 * Assassin's Creed: Odyssey