I don't know how I forgot about this one, but it's done now.
Also, I know of the axe/lake parable, but not too sure if the "Night Princess" is referencing something else. It feels like I'm forgetting something...
EDIT: I think she might be referring to Nocturne when she says "Father" since he's the one making the nightmare.
I don't know if there's same Chinese lore, but (well i am pretty sure East Asia shares every single folk lore)there was a Korean folk lore which went like this: A lumberjack loses his axe in a pond. He cries because his job as a lumberjack is an only way of making his living. The Spirit of the Pond comes up and asks, "which of the axes are yours? The Golden, silver or the old iron axe?" The lumberjack says, "The old one." The spirit says that's some nice honesty and gives all 3 axes.
I'm pretty sure she wasn't supposed to break the axe.
Oh wait, I think the other two "axes" female Nocturne has are a Tiamat and Black Cleaver.
Ohh! Isn't this a dream come true for any axe-wielder!? Now all I have to do is reply honestly, and I'll get two free pieces of gear...I am the goddess of the river, the "Night Princess", and here are three axes that I have recovered from the riverbed... I ask of you, which one of these is yours? Is it the gold? The silver? Or the one inscribed with the words "family heirloom"?The "family heirloom" one.You are very honest, Mr. Berserker. To reward you for your virtue... umm... according to the instructions left by my father... I think I'm supposed to snap your axe in half...OlafI see...Undertow: Olaf throws an axe to a target location, dealing physical damage to units it passes through and slowing them for 2.5 seconds. If Olaf picks up the axe, the ability's cooldown is reduced by 6 seconds.*CRACK**whoosh*Hm... Aren't you...?UOOOOOOHHHH!! MY PRECIOUS! What have you done, you bitch!?That was passed down from generation to generation in my- Hey! Wait! Don't break my other one too!NocturneWhen "Unspeakable Horror" goes off, its target becomes feared.My axe...!Olaf, doesn't your ult make you immune to CC!? Stop enjoying your situation and get the hell back to fighting already!Hmph, flashing into the river's fog of war, are you? How about you eat one of my Undertows! I'll just slow you from afar, and then we'll see where you can still run!