Head Blacksmith Ferris:
Oh, you mean the Beleth's Blood Dragon? I will trade you one Beleth's Blood Dragon for 10 Blood Basilisks and 10 blood succubi... Or perhaps you would prefer a game of chance? That would be fine with me... I'm quite good at this...
Exchange at the set ratio. Play game. [Guess correctly in 2 tries - 4 Blood Basilisks and 4 blood succubi] Play game. [Guess correctly in 3 tries - 8 Blood Basilisks and 8 blood succubi] Play game. [Guess correctly in 4 tries - 9 Blood Basilisks and 9 blood succubi] Explanation of game