To simplify the expression \(Vy^{18}\), we can note that \(V\) is likely a constant (since it does not represent a number) and \(y\) is the variable raised to the power of 18.
Thus, the expression cannot be simplified further without additional context or specific values for \(V\) and \(y\).
The simplified form of the expression remains:
\[ Vy^{18} \]
If \(V\) has specific properties or values, or if you have more context or constraints, please provide that information for further simplification.