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Mom guided us to a special tent "workshop" which she had set up for the last two months. There was a big Magic Cauldron in there, and several other materials she had borrowed, gathered, and bought from everywhere we have visited. Magic Cauldrons were quite indispensable for high level alchemy, as they were special Magic Artifacts that allowed for high level synthesis.
They worked rather interestingly, the alchemist would pour their mana into the Cauldron, making the Cauldron absorb their Mana and turn it into Liquified Magic Essence, which has the color of the rainbow and is a magical liquid. This liquid is used to mix materials and extracts and through Alchemy Magic, turn them into new items altogether, or also useful to fix magic items.
Check "The Protagnist's Sister Is Actually the Strongest"!