Go to The Slough and transmute Barberry Shrubs into Shrubbery Bubbles and gather $1oa of them.
Bring them back to Kumali and observe as she tries to use them to make the stone.
Or maybe de problem is dat we don't need regular reagents. Maybe we need something dat only comes from being transmuted.
Anything's worth a shot at dis point. Here is a recipe my old partner left behind.
He used to go out to de Slough and change de shrubs into bubbles, ya see.
Why, you might ask? 'Cause he loved transmuting everything. Part of de reason we never saw eye to eye.
Anyways, bring me back some of dose bubbles and we'll see if we can use dem to make dis stone.