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Assassin's Creed: Odyssey includes a number of collectibles for the player to search for. One of these is the Ainigmata Ostrakas; they're riddles that lead you to a special location where you'll receive unique buffs. Don't want to waste the brainpower to figure out what the riddle means on your own? We don't blame you! Here, we detail everything you'll need to know in order to track it down.
The Bottomless Lake Riddle
The riddle you receive from this Ainigmata Ostraka is...
"Taking the plunge? Everyone on the island thinks this is the deepest dive, but there is a lake in the Coast of Koliadai that is rumored to be bottomless. If you are able to dive as far as the woman in marble, you will be able to claim me."
While it's a little obtuse, the riddle does detail a specific location that you need to find: the Coast of Koliadai. Let's hunt it down.
Where To Find The Coast Of Koliadai
The "bottomless" lake you're looking for is on the island of Kephallonia.
Keep an eye out for the Coast of Koliadai along the eastern side of the island. There, you should spy a rather significant body of water, just below the "C" in "Coast." That's where you need to go!
Once you arrive, go ahead and dive into this pool. Don't dawdle - your air supply isn't unlimited. As you swim deeper, keep your eye out for a large statue of a woman with one arm raised above her head. Strangely, it's completely intact underwater.
Your Reward For Solving The Bottomless Lake Riddle
When you interact with the statue, you'll receive a boost to your critical damage whenever you are at full health.
In addition to that main buff, be sure to run your eyes along the bottom of this pool - there are several containers to loot that will earn you some more drachmae.