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The origin of the hidden order in URu₂Si₂ remains to be elucidated despite intensive investigations. Our previous study based on quasiparticle scattering spectroscopy (QPS) showed that a hybridization gap opens up well above the hidden order transition temperature, indicating that it is not responsible for the hidden order transition [1]. This is naturally understood by considering the hybridization process as a generic mechanism for emergent heavy fermi liquids in Kondo lattice systems. Then, how different is it in a system where a quantum critical parameter is tuned to result into different ground states? To address this question, we extend our QPS study into URu₂Si_2-xP_x, which has recently been found to exhibit transitions into no-ordered and antiferromagnetic phases with increasing phosphorous content [2]. We will present conductance spectra obtained from this system spanning a wide phase space and discuss the implications of our results. [1] W. K. Park et al., Phys. Rev. Lett. 108, 246403 (2012); [2] A. Gallagher et al., Nature Commun. 7, 10712 (2016).