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Keywords are:  'tornius' reagent'

Tornius' Reagent is an unusual brewing component, in that it does not
contribute to or modify the spells found in any known brews.  However, it
can often make brews more powerful, or allow more of a given brew to be
created with fewer rare components used.

What really makes the reagent special is how easy yet unobvious it is to
make.  The vast bulk of the reagent is composed of simple, nonmagical
animal milk and the ground bone (again from nonmagical creatures.)  While
many types of bone powder can be used spell components, most common herd
animals are non-magical and useless for potion making.

When preparing Tornius' Reagent, the non-magical bone powder and milk are
combined in a heated cauldron with a small amount of volcanic black clay
imported from around K'tin Lake in the southeast mainland.  The properties
of the clay spread throughout the bone and milk, allowing it to be used in
brewing without changing a brew's magical makeup.

You can buy Tornius' Reagent cheaply in most brewing shops.