To simplify the expression \(- (b^{1/4})^{12}\), we can use the property of exponents that states \((a^m)^n = a^{m \cdot n}\).
Applying this to our expression:
\[ -(b^{1/4})^{12} = -b^{(1/4) \cdot 12} = -b^{3} \]
So the equivalent expression for \(- (b^{1/4})^{12}\) is \(-b^3\).
Therefore, the correct choice is:
\(-b^3\).