So after bringing Vanya the (ridiculously expensive) supplies to build a Nostalgic Bovyne Toy, he says, "if you is bringing me some of ehh, how you say? Magic bottle, is containing magic essence. Is LIFE essence. It is making possibles something very specials!"

Is this a reference to an actual bottled essence? I couldn't find a Bottled Life Essence or anything like that, so what might he be referring to? I'm intrigued!

[edit]Neeeever mind. I dug up an old update and figured it out. Essence of Melody.