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From what Acorn has told me, Elixirs are apparently one of the pinnacles of Alchemy. They're special potions that go beyond simply healing and have incredible magical potential that can even surpass curses and strong once thought to be uncurable diseases. There are various Elixir-type Potions, and they all need ridiculously big quantities of items. The list Acorn gave them was the most he could shorten it, but it still required roughly 29 different ingredients. He brought his own ingredients and was able to secure half of the ingredients, and it seems that the fairies have the rest.
A few minutes after the conference, we all gathered in the enormous storage building of the city, as various fairies were carrying large bags filled with herbs and bottles with extracts of many types of oils. There was a gigantic amount of ingredients to do all sorts of Alchemy here! There's even a small Alchemy Guild here, which probably all these ingredients belong to.