Achievement Guide: Aren't You Clever

Major spoiler! This guide explain how to solve the three riddles of the Koschei's fortress. Due to its nature, a large parts of guide is hidden. For the greatest play experience I strongly urge you not to read this guide and solve the riddles (or left it alone) by yourself.

Last warning! Spoiler ahead!

"WHEN THE LIGHT GLOWS BLACK, YOU'RE SAFE AND SOUND.
WHEN THE LIGHT GLOWS PURPLE, INTRUDERS ABOUND!"

"SPEAK THE RIDDLE'S ANSWER AS IT APPEARS.
THREE TIMES CORRECT, THE LIGHT WILL GLOW BLACK.
EVEN ONCE WRONG, THE FORTRESS WILL FEED."

First riddle:
Who eats whom?

• The chick eats the chicken eats the egg.
  
• The chicken eats the chick eats the egg.
  
• The egg eats the chicken eats the chick.

First's answer:
The chicken eats the chick eats the egg.


Second riddle:
What is most precious?

• Wealth
  
• Life
  
• Death

Second's answer:
Death


Third riddle:
Who are you?

• I am a hero.
  
• I am a necromancer.
  
• I am a criminal.

Third's answer:
I am a criminal.


Explanation:

• The first answer is such because as chicken grows, it eats away its previous appearance as a chick, and before that an egg.
  
• The second answer is such mainly because Koschei treasure his "death" so much he hid it so he won't lose it. Furthermore, he seems to collect "deaths" of many beings in his fortress.
  
• The third answer is such because to Koschei, anyone beside him that is able to come that far is surely thieves trying their hand on his treasures.

Note: I got this answer in my first playthrough. There might be other set of answer or the might be not. There might even be no wrong answer. Will confirm this on further run.