High-order nonlinear multiphoton absorption (MPA) is technologically important for a variety of photonic and biological applications owing to its superior advantages over linear absorption and low-order MPA such as greater spatial confinement, larger penetration depth, reduced autofluorescence, and enhanced imaging resolution. However, practical implementation beyond three-photon processes remains notoriously difficult due to the sharp reduction of absorption cross sections with increasing nonlinearity and inherent material instability under high-density irradiation. Herein, we address these challenges through rationally designed Te